Martha's Vineyard, Massachusetts (CNN) Industry and congressional sources say they're prepared for President Barack Obama to reject the Keystone XL oil pipeline soon, even as details on how and when the White House will rule on the controversial project remain unknown.

With concrete information from the administration scarce, the pipeline's proponents instead view the lengthy review process, initiated by President George W. Bush and continued under Obama, as having now taken so long that an affirmative outcome appears unlikely.

The pipeline, which would transport oil from the tar sands of Canada to the Gulf of Mexico, is fiercely opposed by environmentalists who say it would only augment Americans' reliance on fossil fuels.

Obama has taken several new steps to reduce dependence of those fuels in the past several months, including issuing a final rule curbing carbon emissions from power plants by 32% in fifteen years.

At the end of August, he is slated to make another push to bring attention to climate change, first addressing a green energy summit in Las Vegas and later traveling to the Alaskan Arctic underscore the effects climate change are having in the region.

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