http://www.guardian.co.uk/environment/2009/jan/15/climatechange-scienceofclimatechange Could new varieties of wheat and barley save the planet from climate change?
Food scientists claim planet could be cooled by up to 2°C simply by planting crops specially bred to reflect more sunlight
Alok Jha, green technology correspondent
guardian.co.uk, Thursday 15 January 2009 17.00 GMT
Food crops could be used to keep the Earth's temperatures down and slow global warming, say scientists. By growing plants that can reflect more of the sun's radiation back into space, parts of Europe and North America could be cooled by 1°C in the summer, the equivalent of stopping billions of tonnes of carbon dioxide from entering the atmosphere over the next century.
Growing agricultural plants such as maize or barley already cools the climate because they reflect more sunlight back into space than natural vegetation. Different varieties of the same plant can vary in how much light they reflect, a property called albedo, so selecting for higher-albedo crops would enhance the cooling effect from agriculture.
Using the same climate models as the Intergovernmental Panel on Climate Change, Andy Ridgewell led a team of scientists at the University of Bristol to calculate how different varieties of crops would affect global temperatures. "It would be an optimistic scenario that, farming everywhere, people were happy to plant a slightly different variety of crop."
The results, published today in the journal Current Biology, showed that, in the most optimistic scenario with all the world's crops replaced by the most reflective varieties, the world would cool by an average of 0.1C, equivalent to almost a fifth of the warming since the Industrial Revolution.
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