From the Program on International Policy Attitudes (PIPA):
An international poll finds widespread agreement that climate change is a pressing problem. This majority, however, divides over whether the problem of global warming is urgent enough to require immediate, costly measures or whether more modest efforts are sufficient.
Read the rest at their website. One data point: 39 percent of Americans think global warming is an important threat, 46 percent think it is a critical threat, only 17 percent think it is not important at all.