2015's annual maximum of winter Arctic sea ice is the lowest in the satellite record.
Spring is arriving earlier across the U.S. by an average of three days.
Just like our bodies, the climate system can become unbalanced if it gets too much of a good thing.
Atmospheric carbon dioxide levels continue to climb, averaging 400 parts per million for the month of February — the earliest in the year Earth has hit this global warming milestone on record.
This is the first time in at least 800,000 years, and possibly as long as 2 million, that atmospheric carbon dioxide levels have been this high.
Check out key climate milestones, by presidential term.
2014 topped both 2005 & 2010 as the hottest since record keeping began, continuing the trend that the top 10 years have all occurred since 1998.
Transportation accounts for 28 percent of Americans’ overall greenhouse gas emissions. Here's a look at how various modes stack up.