Today, at the International Climate Change Conference (COP15) in Copenhagen, we demonstrated a new technology prototype that enables online, global-scale observation and measurement of changes in the earth’s forests. We hope this technology will help stop the destruction of the world’s rapidly-disappearing forests. Emissions from tropical deforestation are comparable to the emissions of all of the European Union, and are greater than those of all cars, trucks, planes, ships and trains worldwide.

http://blog.google.org/2009/12/seeing-forest-through-cloud.html