The fifth and last kind is called "low-cost backstop," a policy based on a hypothetical low-cost technology for removing carbon dioxide from the atmosphere, or for producing energy without carbon dioxide emission, assuming that such a technology will become available at some specified future date. According to Nordhaus, this technology might include "low-cost solar power, geothermal energy, some nonintrusive climatic engineering, or genetically engineered carbon-eating trees."
http://www.nybooks.com/articles/21494
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Great article about some books on global warming.
The idea of carbon-eating trees is very appealing! All trees help the environment though...why not plant a few at your home?
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