A new report published by the federal government states that climate change is already affecting U.S. water resources, agriculture, land resources and biodiversity.
Forests in the interior West, the Southwest and Alaska are seeing more fires and insect infestations. Water use is on the rise, and invasive weeds are spreading.
The report also notes some positive effects, such as an increase in the average length of the productive growing season in many parts of the country, and young forests growing more productively.
Peter Backlund, director of research relations at the National Center for Atmospheric Research, talks about evidence of climate change and what may be in store for the future.