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from World has 10-Year Window to Act on Climate Warming - NASA Expert:

A leading U.S. climate researcher said on Wednesday the world has a 10-year window of opportunity to take decisive action on global warming and avert a weather catastrophe.
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"I think we have a very brief window of opportunity to deal with climate change ... no longer than a decade, at the most," [NASA scientist James] Hansen said at the Climate Change Research Conference in California's state capital.

If the world continues with a "business as usual" scenario, Hansen said temperatures will rise by 2 to 3 degrees Celsius (3.6 to 7.2 degrees F) and "we will be producing a different planet".

On that warmer planet, ice sheets would melt quickly, causing a rise in sea levels that would put most of Manhattan under water. The world would see more prolonged droughts and heat waves, powerful hurricanes in new areas and the likely extinction of 50 percent of species.
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"We cannot burn off all the fossil fuels that are readily available without causing dramatic climate change," Hansen said. "This is not something that is a theory. We understand the carbon cycle well enough to say that."