LiveScience: The number of Americans who believe global warming isn't happening has risen to 23 percent, up 7 percentage points since April 2013.
The latest survey, taken in November 2013, finds that the majority of Americans -- 63 percent -- do believe in climate change, and 53 percent are "somewhat" or "very" worried about the consequences.
The proportion of people who do believe in climate change has been steady since April 2013, but the proportion of those who say they "don't know" whether climate change...