You have  to give it to Bill Gates these days. Whatever he may have been in his early days, he is clearly on the side of a better life for everyone now. He is putting his considerable financial resources where his mouth is, and trying new things to end some of the problems faced by all of the human race.

In the field of global warming, there have been enough ill-conceived schemes to fill a book the size of a dictionary, an unabridged dictionary. However, a new idea is highlighted showing the use of water vapor to form clouds, which then reflect a portion of sunlight, and keep the global heat gain under control. Though it may take a Herculean effort to carry it off, it is not beyond the realm of possibility, and, more than that, relies upon solid science, which not all of the posited solutions have done.

[Times Online]

The first trials of controversial sunshielding technology are being planned after the United Nations failed to secure agreement on cutting greenhouse gases.

Bill Gates, the Microsoft billionaire, is funding research into machines to suck up ten tonnes of seawater every second and spray it upwards. This would seed vast banks of white clouds to reflect the Sun’s rays away from Earth.

The British and American scientists involved do not intend to wait for international rules on technology that deliberately alters the climate. They believe that the weak outcome of December’s climate summit in Copenhagen means that emissions will continue to rise unchecked and that the world urgently needs an alternative strategy to protect itself from global warming.

Many methods of cooling the planet, collectively known as geoengineering, have been proposed. They include rockets to deploy millions of mirrors in the stratosphere and artificial trees to suck carbon dioxide from the air. Most would be prohibitively expensive and could not be deployed for decades.

However, a study last year calculated that a fleet of 1,900 ships costing £5 billion could arrest the rise in temperature by criss-crossing the oceans and spraying seawater from tall funnels to whiten clouds and increase their reflectivity.

Silver Lining, a research body in San Francisco, has received $300,000 (£204,000) from Mr Gates. It will develop machines to convert seawater into microscopic particles capable of being blown up to the cloud level of 1,000 metres. This would whiten clouds by increasing the number of nuclei.

The trial would involve ten ships and 10,000sq km (3,800sq miles) of ocean. Armand Neukermanns, who is leading the research, said that whitening clouds was “the most benign form of engineering” because, while it might alter rainfall, the effects would cease soon after the machines were switched off.

Other types of geoengineering, such as mimicking volcanoes by using aircraft to spray reflective sulphate particles in the stratosphere, would have much longer effects on weather patterns.

Stephen Salter, Emeritus Professor of Engineering Design at the University of Edinburgh, said that there was no need to wait for regulations because the trials would not add chemicals to the atmosphere. But Sir David King, former chief scientific adviser to the Government, said that experiments with potential consequences beyond national borders needed international regulations. He told The Times: “I do not see any geoengineering solution which does not have unintended consequences or is not far too expensive.”

The ability to put water in the air, and possibly reflect a portion of sunlight is only one good thing about this plan. The water would be moved by the prevailing winds, and would add to rainfall, making a problem of drought in certain areas slightly less prominent. Water, rather than any other compound, would also be the most benign thing to put into the atmosphere. (The idea that someone would think to put sulfates into the atmosphere seems very silly by any measure – can you say acid rain?)

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EARTHRISE putting a few more clouds in the sky means that the earth’s albedo would go up, and less heat gain would occur. The difference would not be dramatic, so those that worry we might turn the look of the Earth into that of Venus need not worry.

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