Greenhouse gases held steady for hundreds of years, but have jumped up since the start of the industrial era.
Trees have widespread climate benefits, from lowering cooling costs to reducing our carbon footprint.
See how trees in these cities are improving air quality, reducing flood risks, and offsetting carbon emissions.
Global average temperature has already warmed 1°C beyond pre-industrial levels, on its way to 1.5°C without deep emissions cuts.
Just like the past four years, 2018 is on pace to be one of the hottest years globally.
May the Force be with you! The arid world of Tatooine and the icy world of Hoth from the Star Wars universe show the importance of atmospheres in a planet’s climate.
Sea level rise from climate change poses threats to Philadelphia, including most of its airport.