believe global warming has been empirically established, only 52 percent of polled Democrats said yes in 1997 compared to 75 percent of them today. A smaller increase was observed among Republicans over that period — from 42 percent a decade ago to 54 percent now.
As for the human role in climate change: Democrats have held steady — at around 70 percent — in their belief that a considerable share of global warming is due to human activities such as burning fossil fuels. Over the same decade,
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, Republicans’ belief that humans must take much of the blame for warming has fallen — from 53 percent in 1997 to 40 percent this past March.
Gallup pollsters also have asked groups of politically affiliated people about whether they feel global warming poses a serious threat to the American way of life. Over the past decade,
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, Dems have increasingly said yes — from 31 percent initially, to 49 percent now. Republicans have also increasingly said yes,
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, though the overall share has been much smaller: 20 percent initially,
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, compared to 26 percent now.
In other words,
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, while virtually half of Democrats currently view global warming as posing a serious threat within their lifetimes,
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, only one-quarter of Republicans feel similarly,
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, report Oklahoma State University sociologist Riley E. Dunlap (who’s also a Scholar for the Environment at the Gallup Organization) and sociologist Aaron M. McCright of Lyman Briggs College and Michigan State University.
The pair argue that the polling data suggest Republicans and Democrats are becoming “more ideologically polarized,
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,”

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