How large of an area of the earth's surface would we need to cover in mirrors to negate current levels of global warming?
Let's assume that the reflective component of the mirror is made of aluminium foil and that it is kept clean.
And let's also forget about ocean acidification. I'm only really interested in negating the retained heat component of atmospheric carbon.
This question was initially asked here on physics.stackexchange but was rejected because it "was an engineering question".