Poll: Americans' concerns about global warming are rising

More specifically, 33% of Americans worry about global warming “a great deal,” 25% worry “a fair amount,” 20% “only a little,” and 23% “not at all.” Full trends are available in the Survey Methods section.

Public concern about global warming has waxed and waned over the past two decades, ranging between 50% and 72%. The average percentage over time for “worrying a great deal/fair amount” comes in at just under 60%, similar to the March 7-10 reading from Gallup’s 2013 Environment poll.

The same poll finds 54% of Americans saying the effects of global warming have already begun.