Two-thirds of U.S. residents support construction of the proposed Keystone XL oil sands pipeline, including an apparent majority of Democrats, new Pew Research Center polling shows.

The same poll released Tuesday also shows increasing belief in global warming in recent years, but a dip from 2012 in the share of people who consider it a “very serious problem.”

The results provide a snapshot of public views as President Obama weighs decisions on carbon emissions policy and the oil pipeline.

On Keystone, 66 percent of respondents back construction of TransCanada Corp.’s proposed pipeline to bring oil from Canadian oil sands projects to Gulf Coast refineries, while 23 percent oppose it.