This is actually really bad as far as emissions are concerned. The emissions from transportation of oil alone are massive, outweighing all other emissions from overseas transport.
Container ships lower earth average temperature by 0.3 °C via SO2 emissions. That's why the IMO limiting sulphur content of bunker fuel was a bad move, which could catapult us above 2 °C.
Not yet, no. Even at the rate things are changing now we've got 20 years before any apocalypse scenarios. We should be working to avoid those at all cost. Even those caught up in the worst of it can flee to areas less affected.
Yeah in America maybe, politicians in Europe mostly acknowledge climate change is real and caused by human activity. However, they often think that climate policies are too expensive and unreasonable, without considering how fucking expensive dealing with the results of climate change will be in the future. Probably because they're old and likely dead by then, so they don't care.
And mindsets like "we can't stop it" and "it's already too late" only contribute to these ideas of climate policies being a nuisance rather than a necessity.
it should balance out somewhat--the u.s. exports are roughly the same as its canadian imports; unless they do something really stupid like increasing what's already historic production levels to make up for the loss of canadian imports.