Hill: The number of people in the United States who say they don't believe in global warming rose by 7 percent last year, a new study shows.
The data from Yale University and George Mason, compiled between March and December, found 23 percent of people don't think climate change is happening.
Out of those surveyed, a majority -- 63 percent -- said global warming is occurring, while 47 percent said human activities are to blame.
Of those who believe in climate change, 53 percent were "somewhat...