An example of the greenhouse effect cooling the climate has been seen in Spain, where the roofs of hothouse farms reflect so much sunlight that they may be pushing down local temperatures.
Since the 1970s, semi-arid pasture land in Almeria, south eastern Spain, has been replaced by greenhouse horticulture.
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According to a report in New Scientist, Pablo Campra of the University of Almeria and colleagues studied temperature trends from weather stations inside the region, and from other areas of Spain.
With the help of satellite data, they compared semi-arid pasture land and greenhouses, looking for differences in surface radiation and albedo, the ability to reflect sunlight.
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Asian pollution from Asian power plants, cooking and heating could create summer hot spots in the central US and southern Europe by the middle of this century.
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The satellite data revealed that the white greenhouses were much more reflective than farmland.
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Process Used by Microbes to Make Greenhouse Gases Identified
Scientists have uncovered a key molecule that lets microbes produce carbon dioxide and methane - the two greenhouse gases associated with global warming.
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Organic Farming can Feed the World, U-M Study Shows
Organic farming can yield up to three times as much food on individual farms in developing countries, as low-intensive methods on the same land.
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