I can think of an easier way. Why not dust the upper atmosphere with aluminum dust? The aluminum would come from recycled aluminum cans. The effect would reflect sunlight causing the earth to cool.
The effects of aluminum dust on the Earth’s living things might be beneficial. You never know. Perhaps humans would get smarter with a little aluminum in their bodies. They might even get smart enough to figure out a better answer to Global Warming. We could always use smarter government leaders to find ways to cool off those hot hot summers.
. . . I couldn’t resist the opportunity to end my evening with a little sarcasm.