"This week's disastrous spill from the existing Keystone pipeline illustrates the risks of transporting oil," One Planet Strategies founder Janet Larsen said.

"There is no such thing as a guaranteed leak-proof pipeline," Larsen told Xinhua.

"The Keystone pipeline represents a serious environmental liability with negligible economic benefits," especially with the United States now exporting oil, she said. "Canadian tar sands oil is not needed."

In its defense, TransCanada was quick to say it had shut down the leak 15-minutes after being detected.

"Fifteen minutes is too long - any time is an environmental tragedy and damaging for decades or even longer," Keever countered.

The radical environmental group Earth First went so far as to advocate illegal action against TransCanada.

"The Keystone spill is just one more example of why direct action against pipelines is justified," Earth First organizer Panagioti Tsolkas told Xinhua.

"Its a reminder that the pipeline companies are the real terrorists and the people who blockade or sabotage their construction are the heroes," Tsolkas said.

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