After a protracted battle with loud and fierce opposition coming from First Nations and environmental groups, public support in Canada is on the decline for the Keystone XL tar sands pipeline, according to a new survey (pdf) published Wednesday.

The study, conducted by the Ottawa-based Nanos Research Group, compares public opinion data from April 2013 to December 2013.

During that period, the number of Canadians who oppose or somewhat oppose the pipeline grew from 27.1 to 40.4 percent.

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Further, 51.6 percent support or somewhat support approval of the project, compared to 67.5 percent who supported or somewhat supported approval in April.

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