Friday, November 30, 2007
Venus today is a hellish place with surface temperatures of over 400°C (752°Fahrenheit), winds blowing at speeds of over 100 m/s (224 mph) and pressure a hundred times that on Earth, a pressure equivalent, on Earth, to being one km (0.62 miles) under the sea.
Hakan Svedhem, ESA scientist and lead author of one of eight studies published on Wednesday in the British journal Nature, says that Earth and Venus have nearly the same mass, size and density, and have about the same amount of carbon dioxide (CO2). In the past, Venus was much more Earth-like and was partially covered with water, like oceans, the ESA scientists believe.
How could a world so similar to Earth have turned into such a noxious and inhospitable place? The answer is planetary warming. At some point, atmospheric carbon triggered a runaway warming on Venus that boiled away the oceans. As water vapour is a greenhouse gas, this further trapped solar heat, causing the planet to heat up even more. So, more surface water evaporated, and eventually dissipated into space. It was a "positive feedback" -- a vicious circle of self-reinforcing warming which slowly dessicated the planet.
"Eventually the oceans began to boil," said David Grinspoon, a Venus Express interdisciplinary scientist from the Denver Museum of Nature and Science, Colorado, USA. "You wound up with what we call a runaway greenhouse effect," Hakan Svedhem says. Venus Express found hydrogen and oxygen ions escaping in a two to one ratio, meaning that water vapour in the atmosphere — the little that is left of what they believe were once oceans — is still disappearing.
While most of Earth's carbon store remained locked up in the soil, rocks and oceans, on Venus it went into the atmosphere, resulting in Venus' atmosphere now consisting of about 95% carbon dioxide.
“Earth is moving along the curve that connects it to Venus,” warns Dmitry Titov, science coordinator of the Venus Express mission.
Venus Express - European Space Agency (ESA)
Venus inferno due to 'runaway greenhouse effect', say scientists
Probe likens young Venus to Earth
European mission reports from Venus
Thursday, October 25, 2007
Combat Global Warming with Evaporative Cooling - by Sam Carana
To combat global warming, wind turbines along the coastline could be used for the dual purposes of generating electricity at times when there is wind and evaporating water at times when there is no wind. Just a small breeze over the water can give the top water molecules enough kinetic energy to overcome their mutual attraction, resulting in evaporation of water and associated cooling of both water and air.
Such dual use of wind turbines can be implemented at many places where turbines overlook water; evaporation will work most effectively in hot and dry areas, such as where deserts or dry areas meet the sea or lakes. Evaporative cooling will add humidity to the air, which can also cause some extra rain and thus increase fertility of such dry areas as a beneficial side effect.
The energy needed to run the turbines can be obtained and stored in a number of clean, safe and renewable ways. ]
At times when there is plenty of wind, surplus energy from the turbines could be used to convert Water into hydrogen by means of electrolysis. Alternatively, bio-waste could be burned by means of pyrolysis to create both hydrogen and agrichar, which could be used to enrich soils. The hydrogen could be kept stored either in either compressed or liquid form, ready to power fuel cells that can drive the turbines at any time, day or night.
Another alternative is to run the turbines on electricity from concentrated solar thermal power plants in the desert. A desert area of 254 km² would theoretically suffice to meet the entire 2004 global demand for electricity. Ausra offers a solar thermal technology that uses the sun's heat to generate steam, which can then be stored for up to 20 hours, thus providing electricity on demand, day and night. Ausra points out that just 92 square miles of solar thermal power facilities could provide enough electricity to satisfy all current US demand.
Finally, there are some environmental concerns about wind turbines. There are concerns about carbon dioxide being released into the atmosphere in the process of making the concrete for the turbines. To overcome this, turbines could be made using alternative manufacturing processes, which can be carbon-negative. Furthermore, a recently completed Danish study using infrared monitoring found that seabirds steer clear of offshore wind turbines and are remarkably adept at avoiding the rotors.
In conclusion, wind turbines have a tremendous potential. They can potentially generate 72 TW, or over fifteen times the world's current energy use and 40 times the world's current electricity use. Offshore and near-shore turbines can make seawater evaporate and thus cool the planet, at times when they are not used to generate electricity.
This article was written by Sam Carana; it can be freely copied and published elsewhere, as long as the autor's name is retained in the article.
Monday, October 15, 2007
In essence, the idea of the FeeBate policy is that a fee is imposed on products that cause emissions of greenhouse gases, while the proceeds of these fees in each case are used to help better alternatives. Items that should attract fees include fossil fuel, fertilizers, meat and polluting concrete. The proceeds of fees on these items should pay for rebates on clean alternatives in energy, such as solar and wind power, respectively supply of agrichar, alternative food (my personal favorite is vegan-organic food served in restaurants in communities without roads) and clean concrete.
This approach constitutes the most effective way to reduce the three major greenhouse gases: carbon dioxide, methane and mitrous oxide. In many respects, markets are best suited to work out which products and technologies should get support - the main criteria should be that they are replacements for items that attracted fees, that they are safe and that they cause little or no emissions of greenhouse gases, or - even better - that they are greenhouse gas negative. Fees can be collected locally as long as each community is serious about reducing greenhouse gases; importantly, the proceeds should fund rebates on local supply of better alternatives. As an example, rebates on supply of clean and renewable energy can be funded by fees on coal that is burned to supply electricity in the area. Similarly, agrichar can be produced by means of pyrolysis from various forms of biowaste - rebates on sales of agrichar can be funded by fees on fertilizers.
The concept should be adopted globally, but implemented locally; levels of fees and rebates can be adjusted on an annual basis, depending on how successfully the shift takes place. This FeeBate policy can be regarded as a form of geo-engineering; it will change the shape of urban planning, agriculture, waste treatment, transport and energy supply around the world; moreover, it will transform politics and the very socio-economic fabric of society on a global scale.
In conclusion, the FeeBate policy that I proposed includes:
- a fee of 10% on sales of new cars with internal combustion engines, with proceeds used to fund rebates for electric cars
- a fee of 10% on sales of gasoline, with proceeds used to fund rebates on purchases and installation of facilities that produce renewable energy
- a fee of 10% on sales of coal, with rebates given when electricity suppliers install facilities that produce electricity from renewable sources
- a fee of 10% on building and construction work using concrete that contributes to global warming, with proceeds used to fund rebates on buildings that used clean concrete
- a fee of 10% on sales of fertilizers, with rebates on sales of agrichar
- a fee of 10% on sales of meat, with rebates and vouchers for vegan-organic foo
Many people already compost such biowaste in the garden, but all too often such biowaste disappears along with the general waste in the rubbish bin. As displayed on the picture below, analysis in Waikato, New Zealand, shows that about half of household waste can consist of kitchen waste, soil and garden waste. Such waste ends up on rubbish tips, where the decomposing process leads to greenhouse gases, such as methane. And all too often, farmers burn crop residues on the land, resulting in huge emissions of greenhouse gases.
All such biowaste could deliver affordable energy by using the slow burning process of pyrolysis to produce agrichar or bio-char, a form of charcoal that is totally black. Organic material, when burnt with air, will normally turn into white ash, while the carbon contained in the biowaste goes up into the air as carbon dioxide (CO2). In case of pyrolysis, by contrast, biowaste is heated up while starved of oxygen, resulting in this black form of charcoal.
This agrichar was at first glance regarded as a useless byproduct when producing hydrogen from biowaste, but it is increasingly recognized for its qualities as a soil supplement. Agrichar makes the soil better retain water and nutrients for plants, thus reducing losses of nutrients and reducing the CO2 that goes out of the soil, while enhancing soil productivity and making it store more carbon.
When biowaste is normally added to soil, the carbon contained in crop residue, mulch and compost is likely to stay there for only two or three years. By contrast, the more stable carbon in agrichar can stay in the soil for hundreds of years. Adding agrichar just once could be equivalent to composting the same weight every year for decades.
Agrichar appears to be the best way to bury carbon in topsoil, resulting in soil restoration and improved agriculture. Agrichar has the potential to remove substantial amounts of CO2 from the atmosphere, as it both buries carbon in the soil and gets more CO2 out of the atmosphere through better growth of vegetation. Agrichar restores soils and increases fertility. It results in plants taking more CO2 out of the atmosphere, which ends up in the soil and in the vegetation. Agrichar feeds new life in the soil and increases respiration, leading to improvements in soil structure, specifically its capacity to retain water and nutrients. Agrichar makes the soil structure more porous, with lots of surface area for water and nutrients to hold onto, so that both water and nutrients are better retained in the soil.
In conclusion, recycling biowaste in the above way is an excellent method to produce hydrogen (e.g. for cars) and to bury carbon in the soil and improve production of food. Agrichar is now produced for soil enrichment at a growing number of places. The top photo shows agrichar in pellet form from Eprida. Australian-based BEST Energies has built a demonstration pyrolysis plant with a capacity to process 300 kilograms of biowaste per hour. It accepts biowaste such as dry green waste, wood waste, rice hulls, cow and poultry manure or paper mill waste. The plant cooks the biomass without oxygen, producing syngas, a flammable mixture of carbon monoxide and hydrogen. The agrichar thus produced retains about half the carbon of the original biowaste (the other half was burned in the process of producing the syngas).
Also important is to compare different farming practices. Carbon is important for holding the soil together. Farmers now typically plough the soil to plant the seeds and add fertilizers. This ploughing causes oxygen to mix with the carbon in the soil, resulting in oxidation, which releases CO2 into the atmosphere. Ploughing leads to a looser soil structure, prone to erosion under the destructive impact of heavy rains, flooding, thunderstorms, wind and animal traffic. Given the more extreme weather that can be expected due to global warming, we should reconsider practices such as ploughing.
Furthermore, the huge monocultures of modern farming have become dependent on fertilizers and pesticides. The separation of farming and urban areas has in part become necessary due to the practice of spraying chemicals and pesticides. Instead, we should consider growing more food on smaller-scale farms, in gardens and greenhouses within areas currently designated for urban usage. Vegan-organic farming can increase bio-diversity; by carefully selecting complementary vegetation to grow close together, diseases and pests can be minimized while the nutritional value, taste and other qualities of the food can be increased.
An issue of growing concern is nitrous oxide (N2O), which is 310 times more potent than CO2 as a greenhouse gas when released in the atmosphere. Much release of N2O is related to the practices of ploughing and adding fertilizers to the soil. Microbes subsequently convert the nitrogen in these fertilisers into N2O. A recent study led by Nobel prize-winning chemist Paul Crutzen indicates that the current ways of growing and burning biofuel actually raise rather than lower greenhouse gas emissions. The study concludes that growing some of the most commonly used biofuel crops (rapeseed biodiesel and corn bioethanol) releases twice the amount of N2O, compared to what the International Panel on Climate Change (IPCC) estimates for farming. The findings follow a recent OECD report that concluded that growing biofuel crops threatens to cause food shortages and damage biodiversity, with only limted benefits in terms of global warming.
All this is no trivial matter. Soils contain more carbon than all vegetation and the atmosphere combined. Therefore, soil is the obvious place to look at when trying to solve problems associated with global warming. By changing agricultural practices, we can add carbon to the soil and can minimize release of greenhouse gases.
- Soils offer new hope as carbon sink
- Surprise: less oxygen could be just the trick
- What we throw away
- The Carbon Farmers
- Living Soil
- BEST Pyrolysis, Inc.
- Eprida, Inc.
- Biofuels could boost global warming, finds studyhttp://www.rsc.org/chemistryworld/News/2007/September/21090701.asp
- Biofuels: is the cure worse than the disease?
Companies producing agrichar:
- terra preta at bioenergylists.org
The car has come to dominate the urban landscape, resulting in a metropolitan conglomeration of suburbs, stringed together along highways. Our most fertile land is now used for roads and cars, and the industries needed to support them. About half the urban area is for buildings, mainly three-bedroom homes on small blocks of land. The other half is used for roads, parks and grassland between roads. A large part of roads, buildings and gardens is also used to park cars.
Ever less fertile land is available food. Global warming forces us to rethink all this. As prices of oil skyrocket, more land is being dedicated to grow bio-fuel, resulting in less land available for food. Also, more extreme weather conditions can be expected, resulting in increasing crop loss.
We need more land to grow fruit and vegetables, in ways as was once the case in traditional gardens and on smaller farms. One place to find such land is by converting roads and office blocks into gardens. This doesn't mean a return to those ‘good-old-days’ of small towns and villages. Instead, we should consider an entirely new type of urban design: communities without roads. Technological progress is not the enemy here. Better security and communication systems can help get such communities off the ground. Electric vehicles can be instrumental in getting such communities off the ground.
What I propose are communities with footpaths and bike-paths instead of roads. Houses would be built close together, around a local center of shops and restaurants. In communities without roads, houses could be smaller, since there's no need to park cars in front or in garages. Building houses close together itself reduces travel distances between them. Pathways to a nearby center could suffice for further daily travel, leading to shops, markets, restaurants, lecture and meeting rooms.
In such a center, people would conveniently eat in restaurants, without traffic and parking hassle and noise - just a short stroll by foot or ride on a bike or in an electric scooter. Eating out means less shopping, since food makes up most of our shopping. It also saves a lot of time - no more shopping, cooking, dishwashing and cleaning, no rubbish to get rid of. Walking more would be good for our health as well.
Living closer together means people could see each other more often, both at home or at such a nearby restaurant. Why travel to an office or University, when you can work or follow courses online? Homeschooling has long proven to be much more effective than school. Why should people be institutionalized, kids packed away into school, the elderly people into ‘homes’ and the sick in hospitals? Instead, we should encourage families to stay together as much as possible and as long as possible in communities without roads.
This would result in huge savings on the current cost of cars, roads, office buildings, car parks, garages, gasoline stations, etc. How much time and money could we save by reducing our daily travel between home and work? And how many lives would be saved if we had less car-accidents? Because of the shared walls between them, townhouses save on the cost of heating in winter and cooling in summer.
To start it off, a University campus could be transformed into a community without roads, where people live and come to learn and work. Anyone who would like to nominate one?
Consumption of red meat from cattle, sheep, goats and other ruminants has long been linked to heart disease, colorectal cancer and further diseases.
The link between meat and obesity has only recently received much media attention, with a focus on the fat and sugar content of fast food.
Similarly, environmentalists have long protested against the loss of biodiversity, as rainforests are cleared to make room for cattle or for soy plantations to feed cattle, all to satisfy global demand for meat.
Now meat has also been linked to global warming in various ways. As the impact of global warming starts to bite, many crops are at risk, due to more extreme weather conditions such as floods, drouhts, storms, heavy rain and moisture. It takes a lot of fertile land to put meat on the table, land that could otherwise be used to grow crops top feed the poor and hungry. At the same time, energy suppliers are increasingly looking at using bio-mass as a replacement for fossil fuel, so food is increasingly competing with energy in agriculture.
Finally, animals like cows and pigs release huge amounts of methane gas, which is twenty times more potent than greenhouse gas as carbon dioxide. A recent study led by Anthony McMichael, professor at the National Centre for Epidemiology and Population Health at the Australian National University, Canberra, provides some figures. It points out that 22 per cent of the world's total greenhouse gases emissions come from agriculture, as much as industry and more than what transport emits. Production and transport of livestock and their feed accounts for nearly 80 per cent of these agricultural emissions, through release of gases such as nitro-oxide and carbon dioxide, but mainly in the form of methane. A cow can belch up to 300 pounds of methane per day. The study was published by the Lancet, at:
Before you try and find more details, note that the Lancet has an elaborate registration process demanding that you name your medical specialty and probably at somepoint your blood type, so if you prefer to bypass such things, you can try BugMeNot, at:
In conclusion, a tax on the sale of meat therefore makes most sense. We could leave it up to politics to work out how high such a tax should be, but a flat 10% tax on all sales of meat looks like a good start. The tax could be higher the more methane was released, which would go hand in hand with compulsory disclosure on products of the amount of greenhouse gases that was needed to produce and ship them. Once we've got a good system in place that displays how many greenhouse gases were released in production, we could tax accordingly. There could be different tax rates, even a gliding scale proportional to the emissions. This would encourage research into different diets for cows or somehow replacing the methane-producing bacteria inside a cow's gut.
If the proceeds of such a tax merely used to help the poor pay rising prices for food, then little will be achieved for the environment. Instead, the proceeds of such a tax should be used to create communities without roads, where people can have vegetable gardens close to their homes. We should start building such communities without roads on university campuses, designing small houses for staff and students to live around shops and restaurants. Small houses need less heating and air-conditioning. If we leave out roads, garages and other car-parking spaces, they can be built closely together, so anyone can easily walk or bike their way around. That would be more healthy as well!
Anyway, it makes a lot of sense to turn vegetarian, or even better vegan. Even if you didn't have ethical problems with eating meat and if you lacked compassion for the poor and hungry, you still would help the environment by becoming a vegetarian and thus yourself!
The Hydrogen Economy is much more than that; it promises to change the fabric of our society. Hydrogen, holds the promise to break up the current cartel of energy suppliers that works hand-in-glove with a military-industrial complex that holds the entire world in a suffocating stranglehold. Hydrogen can clean things up and set the economy free. Hydrogen is the elixer that can remedy our polluting habits to create a better society, without the monopolies, the pollution, the taxes, regulations and the military controls that come with the current ways of supplying energy. Currently, energy is largely obtained from sources that centralize the economy around a single supplier, such as a huge nuclear plant or coal-powered plant. Similarly, oil is pumped up under monopoly conditions and transported in huge tankers, which has created these allmighty oil companies that extend their grip over society through services stations and political lobbying to keep cars polluting the world.
We should look forward to a world in which anyone can capture energy for free in their backyards, from renewable power sources such as solar, wind, geothermal and hydro-power. This energy can be directly stored in fuel cells that are built into heating and cooling systems of buildings, lights, TV-sets, stereo equipment, computers, cars, mowers, scooters, power tools, etc. Wherever you now see rechargeable Lithion batteries used, such as in mobile phones, think hydrogen and you'll get a preview of the bright future that awaits us. Hydrogen fuel cells will enable us to cut the wires through which the puppetmaster controls us now. Hydrogen fuel cells hold the promise to set us free. Let's take a serious effort to give this technology a chance!
How much solar power is needed for all this electricity? How much surface does it take to supply solar energy? The red squares on the image below show how much surface needs to be covered in theory by solar power facilities to generate enough electricity to meet the entire demand of respectively the World, Europe (EU-25) and Germany.
Thursday, October 11, 2007
Such pipes could be 100 to 200 metres long, 10 metres in diameter and with a one-way flap valve at the lower end in order to pump water upwards powered by by wave movement. The water pumped up this way could fertilize algae in the surface waters and stimulate them to bloom. More specifically, pumping up water through such pipes would result in an increased presence in the surface waters of the salp, a tiny tube-like species that excretes carbon in its solid faecal pellets. This carbon would subsequently descend to the ocean floor. The hope is that this could store carbon away for millennia on the ocean floor.
An additional effect would be that the algae produced an abundance of dimethyl sulphide (DMS), a chemical that acts as the precursor of nuclei that form sunlight-reflecting clouds. As more clouds would form above the ocean, more sunlight would be reflected away from the Earth's surface, resulting in relative cooling of the ocean underneath.
US company Atmocean has in fact already started trials with this type of technology, using pipes that bring cold water to the surface from a depth of 200m.
- Mixing the oceans proposed to reduce global warming
- Ocean pipes could help the Earth to cure itself
- Lovelock urges ocean climate fix
Saturday, August 11, 2007
Bill notes that the reflective capacity of such material depends on where it will be positioned in the oceans. The closer to the equator, the more effective it will be. Snow is now predominantly located close to the poles and appears from the sun as two small rims on the edges of Earth that receive less sunshine than any other area on Earth. Yet, this relatively small snow-covered area acounts for a cooling of Earth of about three degrees Celcius, Bill estimates, because snow reflects nearly 90% of the solar radiation that falls on it. Positioning the material closer to the equator will therefore require less surface than the areas of the poles currently covered by snow -- the closer to the equator, the less surface will be needed, in order to achieve the same amount of cooling.
For more, see: Chemcept on Global Warming
Tuesday, July 31, 2007
Another approach is to seek and harvest solar or wind power at locations where there is more permanent wind or sunshine. Wind turbines could be located in the sky. Bryan Roberts, professor of engineering at the University of Technology, Sydney, proposes clusters of wind turbines flying 15,000 feet high in the air. After studying the topic for 25 years, Roberts designed a helicopter-like rotorcraft to hoist a wind turbine high into the air, where winds are persistent and strong. Once there, the wind turbine is powered by its own electricity and keep itself in place, while transmitting electricity to the ground through a cable. Roberts has teamed up with San Diego-based Sky Windpower, which plans to produce a flying wind turbine with four rotors. The rotorcraft will go into the first layer of the atmosphere, called the troposphere. With GPS technology, the crafts can be kept in position to within a few feet.
Instead of using a cable to transport electricity down to the ground, electricity could also be tranferred through microwaves. Decades ago, Dr. Gerard K. O'Neill proposed to locate solar panels in space where solar power would be converted to low-density radio waves, sent to Earth and converted to electricity. O'Neill proposed this as part of a wider plan to colonize space. A publication by William Brown shows that the technology to transmit electricity by radio waves with a high degree of efficiency was already used as far back as in 1965.
Monday, July 2, 2007
An earlier post mentioned Klaus Lackner, physicist at Columbia University, who proposes artificial trees to suck carbon out of the air. The trees suck in carbon dioxide for storage under the ocean-floor in disused oil or gas fields.
Another contender for this award and working along similar lines is Wow Energy, a Texan company that builds equipment to clean the air from pollutants. They originally developed their technology to provide a cleaner process at the point
of emission, e.g. when burning fossil fuel at a power plant ("clean coal"). Note that the Branson award is to clean ambient air from greenhouse gas emissions, as opposed to scrubbing done at power plants or through filters in cars, but if it works well for ambient air then that would be great. For more details, go to Wow Energies
Monday, June 4, 2007
See A stairway to heaven? in The Economist
Tuesday, May 15, 2007
1. Geothermal power from Iceland
In April 2007, the Icelandic National Energy Authority signed a deal with Energie Baden-Wuerttemberg from Germany, to work on electricity being transmitted to Germany from Iceland. A 1,200-mile ocean-floor cable is envisaged to carry electricity to Britain’s national grid before reaching Germany. The proposal is to drill 3.8km through the Earth's crust into the hot basalt below, in order to tap into temperatures of up to 600C and generate enough geothermal electricity to power up to 1.5 million homes in Europe.
See Iceland’s hot rocks may be power source for UK in The Sunday Times
2. Hydropower from Congo
The Grand Inga power station is a project to harness hydropower of the Congo River. Located near the mouth of the Congo River, with an output of 39,000 megawatts, Grand Inga would be the world's biggest hydroelectric scheme, generating twice the power of China's Three Gorges dam.
Three electricity superhighways would deliver power south to Angola, Botswana and South Africa, west towards Nigeria and north to Egypt and - ultimately - southern Europe. The project might cost $US80billion, but power delivered from Grand Inga to the Italian border would cost less than the current market price of electricity in Italy today.
See Africa waits on scheme to harness the power of the Congo River in The Sunday Times
3. Thermal solar power from Africa
The Trans-Mediterranean Renewable Energy Cooperation (TREC) was founded in September 2003. One proposal is for Thermal Solar Power to be generated in the deserts of Africa, for transmission by means of High-Voltage Direct Current cables to Europe, with losses of only about 3% per 1000 km, adding up to losses across the Mediterranean of 10-15% to Europe.
The above picture below is from:
The red squares on the image represent the theoretical space needed for solar power plants to generate sufficient electric power in order to meet the electricity demand of respectively the World, Europe (EU-25) and Germany, based on data from a study by the German Center of Aerospace (DLR), P. 12 bzw. 26, 2005.
Monday, May 14, 2007
See the article Keep Earth cool with Moon dust in the NewScientist
Monday, May 7, 2007
For more details, see:
Five Ways To Save The World
Stephen Salter proposes to make rain with floating wind turbines that make very choppy waves, known as Faraday waves. A high-frequency ultrasonic generator would spin seawater around inside a grooved drum, producing tiny waves that are thinner than a human hair, throwing tiny droplets of water from their crests up into the air. As this fine mist of sea-spray evaporates, tiny particles of sea-salt remain in the air and get sucked up into the air, especially when the sunshine causes rising currents of air. These little salt particles act as centres attracting extra droplets to form darker clouds further up in marine stratocumulus clouds. Stephen envisages a multitude of ships to criss-cross the oceans, remotely controlled with their position tracked through GPS and their destination determined by wheather patterns. This idea of making rain in this way could also be combined with another idea discussed earlier in this group, i.e. of exploiting temperature differences in the sea. http://groups.google.com/group/greenhouseeffect/msg/4a21d06ae5b08c04
The deeper you go down into the ocean, the colder it gets. At the lowest points, the temperature is near freezing point. Ships could drag a pipe along, reaching down a few hundred metres into the ocean. Through this pipe, cold water could be pumped up by a solar-powered pump to be released back into the sea from a little tower of, say, two metres high. As the cold water falls down into the sea, the evaporation will act as an air-conditioner. Furthermore, condensation around the top of the pipe will drip down and can be captured in containers, to be sold as fresh water. So, apart from harvesting clean, potable water in the above way, such a ship could also be anchored at a location where it could throw part of the seawater up into the air in the way Stephen Salter proposed, as a fine mist, in order to produce more rain in the proximity of a dry area on land.
Sam Carana - Tabling ideas - From Rainmaking to Sunshields - March 3 2006
Sam Carana - Vital Signs 2005- Vital Facts - May 20 2005
One such proposal is by Paul Crutzen, who won the Nobel Prize for chemistry when he discovered the causes of the hole in the ozone layer. Paul proposes to shoot hundreds of rockets loaded with tons of sulphur into the stratosphere to create a vast, but very thin sunscreen of sulphur around the earth. The proposal was discussed in the BBC documentary:
Five Ways To Save The World
Such trees could be planted anywhere. A small one could sit like a TV on the lawn to balance out the CO2 emitted by one person or family. A large tree, the size of a barn, could sit in the open air, near repositories for easy transportation and storage of carbon. Klaus Lackner estimates that some 250,000 such trees worldwide would be needed to soak up the CO2 produced by human activity annually.
BBC News, 21 February 2003
Earth Institute at Columbia University
More recently, Klaus Lackner's trees featured prominently in the BBC documentary
Five Ways To Save The World
by Kenneth I. Roy, PE and Robert Kennedy, PE.
Over the years, the concept has been discussed in many posts, including in the geo-engineering group by Sam Carana
The ABC show, Good Morning America, on January 29, 2007, featured a clip on mirrors in space, featuring a proposal by Roger Angel, University of Arizona, to send many small discs into space to form giant mirrors deflecting some of the sunlight from Earth.
Roger Angel's research into the feasibility of cooling the Earth with a cloud of small spacecraft near the inner Lagrange point (L1) has been discussed at:
National Academy of Sciences
National Institues of Health
Former Vice President Al Gore and Virgin CEO Richard Branson talk with Harry Smith about the prize in the interview below.
Saturday, May 5, 2007
Since that time, a lot of water has flowed under the bridge and many prototypes have been made.
Four students at University of British Columbia worked for four months on a prototype that makes 15 Watts of energy in 10 inch high waves.
Here's a video called Taming the waves, about a project in Cornwall (UK)
Another video shows a device by Solarist
This video by SwellFuell shows a device coined Pandorra's box that uses a flywheel to get a more continuous flow of electricity.
And here's another one:
Instead of relying on solar cells, the tower acts like a giant greenhouse. The sun's energy is harnessed to create warm air currents that will drive a series of power generating turbines inside the tower. Located under the glaring sun of the Australian outback, the 50 megawatt pilot project will stand taller than Chicago's Sears Tower and sit 260 feet in diameter at the base. The capacity for the technology is far greater though, and has gained the attention of Chinese investors. In 2002, Xiang Jiang Industrial became EnviroMission's second largest shareholder and plans to build a 200 megawatt tower in Shanghai, China.