The poll also asked participants—1,007 Americans and 1,013 Canadians—which was more important: reducing greenhouse-gas emissions or having North America free from oil imports? Both a majority of Americans and Canadians, 63% and 55%, respectively, suggested reducing reliance on oil imports trumped environmental policy.
"Energy security, particularly in the U.S., is driving views on energy issues," said Nik Nanos, president of Nanos Research.
Environmentalists argue that development of the Alberta oil sands for the crude that Keystone would carry will increase emissions of greenhouse gases.
The Nanos poll contacted Americans between March 28 and April 7, and Canadians between April 6 and April 9.
The Obama administration is, for a second time, reviewing TransCanada’s application to build Keystone after rejecting the project in 2012. Keystone faces stiff opposition in the U.S. from environmental groups and key Democratic policy makers.