Can anyone else help me 'rank' the technologies?  Just because people
talk about a tech lots doesn't mean it's actually any good!  I'm
getting the impression that the following are basically in/out

IN
Sea water spraying
Sulphur stratospheric seeding
Ocean fertilisation with iron/urea
White roofs (nice but not very effective)

DON'T KNOW
Limestone powder into the sea
Fake plastic trees
Biochar
Removing HCl from oceans

OUT
Nuclear bombs
Space mirrors
Shiny balloons
Sea albedo from litter/pykrete
Low level soot and sulphur burning

This is obviously just a  list based on my bar stool expertise.  If
anyone with more knowledge could help that would be appreciated.  Any
references to an objective ranking system that I can put in the wiki
would be appreciated.

A

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