On Tuesday, 9 May 2017 09:34:38 UTC-4, Chris L Peterson wrote:
On Mon, 8 May 2017 23:43:54 -0700 (PDT), RichA
wrote:

This is a good one. Like some Brit's plan to build $1.5 billion plants to...put C02 on the bottom of the ocean.

Smart. We're going to need inexpensive options like this to help turn
around global warming.

$500 billion is "inexpensive." How about we cut the entire world's foreign aid to the Third World for this?
Also, partial decay of that much plastic would destroy the ocean ecosystems.