National Parks' physical boundaries might not change, but their climate boundaries will as the world warms.
Hot weather can trigger high levels of air pollution that can have health consequences for millions of Americans.
The risk of mosquito-borne diseases, like Zika, is becoming more prevalent as our mosquito season gets longer.
Scorching summer temperatures are exactly what we should expect in a warming world.
Rising extreme heat and humidity in the U.S. cities threaten public health.
New analysis shows how climate change is influencing a dramatic increase in large western wildfires.
Since the first Earth Day was celebrated in 1970, average temperatures across the U.S. have been rising.
Analysis shows emissions reductions will need to be dramatically accelerated to meet the 1.5°C COP21 goal.