People have proposed methods to cool the earth, because it does not seem feasible to reduce CO2 enough.
A study by Lenton and Vaughan compares cooling proposals. Most have huge side effects, but bio-char, reflective roofs, and reduced soot seem to have the least harmful side effects (data on roofs and 3-year results). Bio-char has the negative effect of making soil absorb more sunlight, but this can be minimized, and more reflective varieties of crops can also help.
Lenton and Vaughan make the following four points:
* "By 2050, only stratospheric aerosol injections or sunshades in space have the potential to cool the climate back toward its pre-industrial state...
* "[L]arge reductions in CO2 emissions, combined with global-scale air capture and storage, afforestation, and bio-char production, i.e. enhanced CO2 sinks, might be able to bring CO2 back to its pre-industrial level by 2100,
* "[S]tabilising CO2 at 500 ppm, combined with [more reflective]... clouds, grasslands, croplands and human settlements might achieve a patchy cancellation....
* "Ocean fertilisation options are only worthwhile if sustained on a millennial timescale... Enhancing ocean upwelling or downwelling have trivial effects on any meaningful timescale."
Go to the Study of cooling options
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Dates are assigned arbitrarily to sort the articles.