One such extreme option includes shooting pollution particles into the upper atmosphere to reflect the sun's rays.
Hmm. Aren’t we supposed to be against polluting the environment? And if this is so great, why not build lots of dirty coal-fired power plants and at least get the benefit of cheap electricity and energy independence?
Another geoengineering option ... mentioned was the use of so-called artificial trees to suck carbon dioxide—the chief human-caused greenhouse gas—out of the air and store it.
Real trees aren’t good enough?
[UPDATE] Hah! According to NASA:
Sulfates, which come primarily from the burning of coal and oil, scatter incoming solar radiation and have a net cooling effect on climate.
[W]ith China building sulphur-belching coal power stations and diesel vehicles at a furious rate in recent times ... it's at least possible that this has something to do with the fact that global temperatures have actually dipped slightly over the last couple of years.