Former NASA Goddard Institute for Space Studies James Hansen said in 2010 that exporting oil from the Albertan tar sands would mean "game over for the climate."

TransCanada made national headlines in 2017 after seizing the land of American property owners in Texas through a legal process known as "eminent domain" to complete the Keystone system - that caused national outrage and support from Hollywood actors.

The company's ambitious, proposed "Keystone XL" line would run 2,164 kilometer from Canada though the western states of Montana, South Dakota, and Nebraska, and was met with stiff resistance and rejected in 2017 by then President Barack Obama.

But in January of this year, President Donald Trump signed a presidential memorandum to permit the pipeline's completion.

Ironically, the spill occurred on the eve of a vote next week by Nebraska commissioners to allow the Keystone XL extension through their state.

"This spill puts an exclamation point on the need to reject Keystone XL, but it doesn't tell us anything we didn't already know about pipelines," environmental group "350.org" posted Friday.

"That the Nebraska commissioners won't consider safety in their decision on Keystone XL should alarm everyone," 350's Sara Shor said.

Other U.S. environmental groups jumped on the oil spill as proof of the extreme dangers and environmental risks posed by continued fossil fuel production.

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