The state's program will be able to test the theories about whether cap-and-trade reduces pollution without destroying businesses. If it works, expect other states to quickly follow.

China is still considered a developing nation, but the country's CO2 emissions are set to rival the U.S. in the near future.

It may be responsible for the financial meltdown, but while it was writing bad mortgages, Bank of America was also doing excellent work reducing its footprint.

In addition to knowing your exact route and even how many calories you've burned, you can now find out the environmental impact of every public transit trip you take--and how much better it is than if you had taken a car.

Jamming carbon deep underground has long been a proposed solution to our emissions problems, but it's expensive and rarely used. Now we can use the Earth's heat to make that gas work for us.

Besides creating climate change, carbon dioxide emissions are an important measure of how healthy we are. New technology could save lives by making it easier for doctors to monitor your CO2.

Is hydrogen actually clean, or just clean compared to fossil fuels? Even though it mostly produces water, there are some nasty side effects no one is talking about.

A new case brought by teens argues that the government isn't protecting the planet for future generations. Do older climate cases give any clues about whether it will work?

What happens in a country with 1.3 billion people and a rapidly growing economy? You might be surprised.

Physically altering the planet's atmosphere to stave off climate change would be incredibly expensive--and disastrous if we ever stopped paying.