Greenhouse Gases

Carbon dioxide in Earth's atmosphere just reached a major milestone

Grow food, not grass, to fight climate change

Sweltering 2016 is a warning from the future

As U.N. makes history on Earth Day, Leonardo DiCaprio reminds us not to rest on laurels

Ozone hole nears record-breaking size again

3 reasons not to expect a 'mini ice age' in 2030

The Pliocene called. It wants its CO2 levels back.

Greenhouse effect is observed and getting worse

NASA unveils satellite's 1st CO2 map of Earth

Biggest U.S. methane source spotted from space

Leaked U.N. report warns of 'irreversible' warming

5 things to know about the EPA's new CO2 proposal