Two-thirds of Americans support the United States joining a binding international agreement to curb growth of greenhouse gas emissions, but a slim majority of Republicans remain opposed, the poll found. Sixty-three percent of Americans — including a bare majority of Republicans — said they would support domestic policy limiting carbon emissions from power plants.

Public support for international and domestic measures to address climate change may provide a lift for American negotiators attending the major United Nations climate change conference that began in Paris on Monday. But the stark partisan divide on climate policy will still make it difficult for President Obama and his successors to put in place the energy and climate policies that will be needed to support a robust international agreement, the goal of the Paris talks.