By Ron Johnson

When President Donald Trump signed off on a presidential permit okaying the Keystone XL crude oil pipeline in March, it was a real blow to an environmental movement that had tasted victory over the dirty tar sands clunker back in 2015 when President Obama withdrew the permit for the project.

With Trump and Canadian Prime Minister Justin Trudeau united in their support of the pipeline, it seemed little could stand in the way of some 830,000 barrels of dirty tar sands fuel barreling down a 36-inch crude oil pipe from Hardisty, Alberta through Montana, South Dakota and Nebraska to export terminals in the Gulf of Mexico. The pipeline seemed destined to pass over, under, and through environmentally sensitive areas such as Nebraska's Sandhills, and put at risk the Ogallala Aquifer, one of the world's largest underground freshwater sources.

But not so fast.