Because Line 3 is a crude oil pipeline, and pipelines leak because that’s what they do. McKibben, via LGM:
It’s easy to forget now how unlikely the Keystone fight really was. Indigenous activists and Midwest ranchers along the pipeline route kicked off the opposition. When it went national, 10 years ago this summer, with mass arrests outside the White House, pundits scoffed. More than 90 percent of Capitol Hill “insiders” polled by The National Journal said the company would get its permit.
But the more than 1,200 people who were arrested in that protest helped galvanize a nationwide — even worldwide — movement that placed President Barack Obama under unrelenting pressure. Within a few months he’d paused the approval process, and in 2015 he killed the pipeline, deciding that it didn’t meet his climate test.
“America’s now a global leader when it comes to taking serious action to fight climate change,” Mr. Obama said. “And frankly, approving this project would have undercut that global leadership. And that’s the biggest risk we face — not acting.”
And that’s what puts the Biden administration in an impossible place now. Enbridge wants to replace Line 3, which runs from Canada’s tar sands deposits in Alberta across Minnesota to Superior, Wis., with a pipeline that follows a new route and would carry twice as much crude. It would carry almost as much of the same heavy crude oil as planned for the Keystone XL pipeline — crude that is among the most carbon-heavy petroleum on the planet.
An environmental cause that is really an economic question. The slim chance of recouping the cost of building the pipeline before crude oil usage decline makes it no longer viable builds a strong case against pipeline, maybe even stronger than it leaking – which it WILL do, because…
Not easy, but becoming more clear as the science gets tangled with economics, in a good way!