Chart of the Week: Climate change is already here
Average temperatures have risen over the past century in nearly every part of the U.S. outside the Deep South.
Americans agree the next 50 years will be a period of profound scientific change, but they are divided on which developments will come to pass and whether they would be a good or bad thing for society.
While Republicans and independents continue to favor constructing the Keystone XL pipeline, Democrats are divided. Opposition to the pipeline is most widespread among highly educated Democrats, liberals and Democrats with high family incomes.