From deluge to wildfires, summer 2018 was one of extremes in the U.S.
Smoke pollution from wildfires threatens the advancements the U.S. has made in cleaning its air.
Longer frost-free seasons mean longer allergy seasons, a trend impacting all regions of the country.
Lyme disease is increasing in the Northeast, and is likely to spread to other areas as the world warms.
Summers are getting hotter across most of the country.
From June through September, the Southwest Monsoon dominates life in much of South Asia.
Studies suggest a warming climate will further increase the number of stagnation days, a key factor influencing air pollution.