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A new poll from the Associated Press and GfK asked (PDF) respondents not whether they agree or disagree, but how confident they are, about various claims about science. The Associated Press (April 21, 2014) summarized, "Americans have more skepticism than confidence in global warming, the age of the Earth and evolution and have the most trouble believing a Big Bang created the universe 13.8 billion years ago."
A new poll from the Pew Research Center and Smithsonian magazine offers a degree of insight into American scientific literacy on natural selection, the age of the earth, and climate change, although there were no questions directly addressing evolution in the sense of common ancestry or climate change in the sense of anthropogenic global warming.
In a recent survey, voters overwhelmingly accepted that improving the quality of science education is important to the competitiveness of the United States in the global scene — and a majority agreed that there's a lot of room for improvement.
"After a period of declining levels of belief in global warming there appears to be a modest rebound in the percentage of Americans that believe temperatures on the planet are increasing," according (PDF) to the latest National Survey of American Public Opinion on Climate Change.
Almost half — 47% — of Americans surveyed in 2010 agreed that "human beings, as we know them today, developed from earlier species of animals," and 38% agreed that "the universe began with a huge explosion."