Man - made climate change is adversely affecting the U.S. , says a federal official . Report : Authors of the comprehensive report said they hope it can serve as a valuable tool for policymakers and other Americans , such as farmers making crop decisions or local governments passing zoning restrictions in coastal areas . Changes will stress water resources , challenge crops and raise sea levels . Document is prepared by White House senior adviser and approved by Congress . Report 's predictions : Hotter heat waves , more flooding and an increase in wildfires .
Man - made climate change is adversely affecting the U.S. , says a federal official . Report : Changes will stress water resources , challenge crops and raise sea levels . Document is prepared by White House senior adviser and approved by Congress . Report 's predictions : Hotter heat waves , more flooding and an increase in wildfires .