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.
Even small concentrations of smoke pollution from wildfires can be harmful to human health.
The number of days a year that mosquitoes can transmit disease is increasing in much of the U.S.
The number of consecutive hot summer days, or heat streaks, is increasing in much of the U.S.
The number of extremely hot summer days is increasing in much of the U.S., and with it, the risk of heat-related illness.
Summers are getting hotter and this is coming with a cost — cooling demand.