More Americans believe increases in the Earth’s temperature over the last century are due to pollution from human activities (57%) than to naturally occurring changes in the environment (40%). The balance of views on this issue is essentially unchanged from 2013, but reflects broader agreement with the idea that mankind is responsible for global warming than was the case from 2010 through 2012, when barely half believed it. Agreement that human activities are responsible has yet to return, however, to the 61% level seen as recently as 2007. CONT.
Lydia Saad, Gallup