Just a technical note - when he mentions at 5:40 'SOx and NOx' those are sulphur oxides and Nitrous oxides - components of smog and, if in a 3-atom form such as NO2, a 'greenhouse gas'. That's what the 'scrubbers' he refers to are removing.
Search DP for 'algae' for a couple things I've posted...
It was probably the pandas
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