In a more acidic ocean, shellfish, plankton and corals struggle to adapt.
CO2 mixes with seawater to form carbonic acid, making the oceans more acidic.
What scientists know well, and what's left to learn, about extreme weather and climate change.
Greenhouse gases are trapping a lot of heat in the climate system and most of it is ending up in the ocean.
Every state in the U.S. has warmed since the first Earth Day, although the rate of warming varies. Check out how much it’s warmed in your state.
While any one month with above average temps might reinforce the reality that the world is warming, it’s the trend of that really stands out.
Since the advent of modern recordkeeping in 1880, the global average temperature has risen 1.6°F.
This year's sad California snowpack "obliterates" the previous record low.