WASHINGTON, D.C. — Record percentages of Americans are concerned about global warming, believe it is occurring, consider it a serious threat and say it is caused by human activity. All of these perceptions are up significantly from 2015.

Forty-five percent of Americans now say they worry “a great deal” about global warming, up from 37% a year ago and well above the recent low point of 25% in 2011. The previous high was 41%, recorded in 2007. Another 21% currently say they worry “a fair amount” about global warming, while 18% worry “only a little” and 16% worry “not at all.”