Wed Apr 01, 2009 10:55 pm
Controlling carbon dioxide levels once meant protecting forests for natural filtration and limiting the use of fossil fuels, which produce greenhouse gases such as carbon dioxide. Scientists are now developing a synthetic tree that could extract almost 90,000 tons of carbon dioxide from the air each year. That is about the amount of carbon dioxide produced annually by 15,000 cars. The synthetic trees would stand more than 300 feet tall and 180 feet wide and look like a large football goalpost with venetian blinds between its posts.
The device would extract carbon dioxide from the air by using liquid sodium hydroxide, which is converted to sodium carbonate as the carbon dioxide air blows through it. Scientists could then draw the carbon out of the sodium carbonate and convert it into a condensed form of carbon dioxide that can be buried underground.