The poll suggests that a solid majority of the public feels that global warming is real, a result consistent with other polls that have asked the question in various ways.
. . .
While many online polls are not representative of the broad public, Knowledge Networks is noted for its efforts to overcome this problem, including giving computers to households too poor to have them. The survey reveals public attitudes that are at least roughly consistent with scientific understanding of how the climate is changing.
For instance, when people were asked whether they attributed specific events to global warming, recent heat waves drew the largest majorities. Scientists say their statistical evidence for an increase of weather extremes is indeed strongest when it comes to heat waves.