The Gov. can push it through for the National interest order if they wanted too
Slap the 'national security' label on it and the complaints can be taken to court in the century that follows it being completed.
If this is to give the impression the Indians have some leverage it is a big fail as the cancellation came on the heels of the EU getting a big line coming from Russia, as will China as that line was built during the sanctions of the last few years.
There are enough polluted lakes just north of Prince George to show that the Govt regulations in place are not followed by the foreign businesses that were the 'miners' and they were not made to clean up anything once the mine did not produce a profit for the foreign owners. Rather than the locals being shit out of luck the Govt that failed to collect damages should pick up the bill rather that say they tried but were outlawed in a kangaroo court.
Chaff from the right plants would seem to be the best and cheapest solution. Drop it with water bombers and before it settles to the bottom to become mud it will pick up very small particles. The fluff from cattails might be the right stuff and that can be farmed and spread by small boat. One ft per year should show pretty fast if it will work or not, if it does work the Pacific could probably use some of the same when its waters show signs of a pollutant than can be cleaned up by men doing a bit of intervention.
Dead water that we make might be better off being dumped into the water below where all the plastic in the Pacific is gathering. It would be taken to the floor of the ocean and it they contain 'heavy elements' those will be staying there while the water keeps moving like always.
