Just two quick things:
The ocean takes up Carbon Dioxide in large quantities, but most of it is dissolved, not sequestrated.
Also, I think only 6 % of the plastic waste (including microplastic) end up in the ocean. The vast amount is (currently) ‘sequestrated’ in the soil.
But you are definitely correct: we should not allow our plastic to be in the the ocean.
Re: public transport in LA - wasn’t it the case that GM and other car makers basically bought the PT and shut it down?