Most Americans believe the climate is changing, according to various polls, but double-digit percentages do not. And of those who acknowledge the problem, the number of people who think humans are responsible – or who are alarmed by it – falls much lower. In California, according to a Public Policy Institute of California poll released last year, an overwhelming eight in 10 people view global warming as a threat to the state’s economy and quality of life, but fewer than half – 49 percent – say it is a very serious problem.
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