The benefits of a price on carbon outweigh the costs several times over.

Polar bears are in danger of extinction as well as many other species.

Global temperature is still rising and 2010 was the hottest recorded.

Evidence is building that net cloud feedback is likely positive and unlikely to be strongly negative.

When you account for all of the costs associated with burning coal and other fossil fuels, like air pollution and health effects, in reality they are significantly more expensive than most renewable energy sources.