WASHINGTON -- Anything that allows America to continue its narcotic-like dependence on carbon fossil fuels -- whether the sprawling tar sands of Canada or the petroleum pools under Alaska 's Arctic National Wildlife Refuge -- completely misses the point about shifting to alternative energy sources.

Alternative sources should be real energy alternatives like wind, solar and geothermal power rather than alternative fossil fuel sources that often give off more greenhouse gases than conventional crude oil.

Without making that crucial distinction we will continue to stoke the boilers of global warming that are destroying our planet 's all-too fragile environment at an ever-increasing rate.

Congress was wise to ban oil drilling in ANWR, one of the most pristine areas on Earth, and it would be equally wise to ban the import of oil from the tar sands of Alberta in Canada. Our Congress also should support efforts by far-sighted Canadians, who are pushing for a moratorium on the further development of Alberta 's tar sands.

Unfortunately, recent reports estimate that Alberta 's tar sands could produce 3.1 million barrels of oil per day by 2015.

That 's a much too tempting opportunity for Canadian businessmen and politicians to line their pockets with increased profits from rising global oil prices by shipping quickly across the border to desperate gas-swilling Americans,

The one sure way to prevent this monumental crime against the environment is for Congress to immediately ban the import of oil processed from tar sands. The fact that existing Canadian pipelines will result in more than half of Alberta 's tar sands oil moving southward ought to provide all the impetus Congress needs to impose this very sensible -- and highly moral -- ban.

Opponents can seek to label this action as "too drastic " but only drastic action now will eliminate the attractiveness of tar sands oil and eliminate much of the profit motive for its exploitation.

And exploitation it is! Extracting oil from tar sands relies on surface mining that requires defoliation of tress and destroys wildlife habitat -- compounding the injury to the environment. Destroying trees that produce oxygen and removing carbon dioxide from the air creates a nightmarish situation that will only accelerate the coming global warming catastrophe.

How many more tornadoes ripping through Atlanta 's downtown and super-hurricanes devastating New Orleans will it take to wake up Canadian oil profiteers that their gated communities and Caribbean luxury condos are located on the same planet the rest of us inhabit?

With the United Nations issuing report after report on the disastrous effects of global climate change, even the Pentagon is now concluding that global climate change will adversely affect our national security and increase world instability.

The irresponsibility of Big Oil and its political allies in Edmonton and Ottawa can only be checked by urgent congressional action that once and for all removes the United States as the world 's top customer for tar sands oil..

Congress was wise to include in last year 's energy legislation a section that stops federal use of high-carbon content energy from non-conventional petroleum sources like tar sands. That means the U.S. military, the U.S. Postal Service, and government vehicles are banned from using fuel from tar sands, oil shale or coal.

It 's a good start but Congress should now extend the ban to the rest of the United States and resist efforts by Alberta 's Conservative Premier Ed Stelmach and Canada 's Tory Prime Minister Stephen Harper to force their "dirty fuels " on U.S. consumers.

Only a concerted effort by the United States and Canada to shift to non-carbon fuel energy sources can help mitigate the mounting effects of severe climate change.

Wind, solar, tidal, geothermal and bio-fuels should be the order of the day in both Washington and Ottawa. Alberta 's tar sands -- tantalizing as they are -- should remain buried forever.

Wayne Madsen is a Washington-based author and columnist and a contributing writer to the liberal Online Journal (www.onlinejournal.com).