• Roughly half of all Americans believe that global warming is already causing or making the following things worse in the United States: coastline erosion and flooding, droughts, hurricanes, rivers flooding, and wildfires.

• Public understanding that global warming is happening rose 3 points, to 64 percent.

• Public understanding that it is caused mostly by human activities declined three points, to 47 percent.

• Public understanding that most scientists think global warming is happening rose 5 points, to 39 percent.

• Trust in scientists and federal agencies remains high.

Americans' Global Warming Beliefs and Attitudes in May 2011 reports results from a national survey of Americans' global warming beliefs and attitudes. The survey was fielded from April 23 to May 12, 2011 with 1,010 adults, using the online research panel of Knowledge Networks. The report includes measures of public global warming beliefs, risk perceptions, personal importance, information needs, trust in different information sources, and how these have changed since June 2010, January 2010, and November 2008.