Although the scientific community has no consensus over whether global warming exists, if it was caused by humans, or even if it's a bad thing, one group here is proposing that we create a permanent structure in orbit to block sunlight and cool the planet down.
Of course, if the warming trend we're believed to be in is part of a natural cycle, this ring will ensure that the next natural cooling-cycle (meaning ice age) will end up being much more severe, because we won't have all that sunlight anymore. And without this light, we might not be able to emerge from this ice age.
You think it's a natural disaster when we have a few hot summers in a row? How about when most of the planet dies off due to a few hundred years of freezing?
And all this disaster can be yours for only $200 trillion of your tax dollars.