Through its impacts on the climate, CO2 presents a danger to public health and welfare, and thus qualifies as an air pollutant

The effects of enhanced CO2 on terrestrial plants are variable and complex and dependent on numerous factors

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

If every nation agrees to limit CO2 emissions, we can achieve significant cuts on a global scale.

CO2 limits won't cool the planet, but they can make the difference between continued accelerating global warming to catastrophic levels vs. slowing and eventually stopping the warming at hopefully safe levels.

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

All the indicators show that global warming is still happening.

Internal variability can only account for small amounts of warming and cooling over periods of decades, and scientific studies have consistently shown that it cannot account for the global warming over the past century.

A large amount of warming is delayed, and if we don’t act now we could pass tipping points.

Multiple sets of independent observations find a human fingerprint on climate change.

Models successfully reproduce temperatures since 1900 globally, by land, in the air and the ocean.