Oops, we're screwed. OK, seriously, does anyone think that world leaders have the motivation to change our ecological momentum in such short a time span? The scale of the problem is way outclassed by the sheer arrogance of the people who are screwing it up, which is why we're screwed. Not because of the technology. Because of the people.
The best we can hope for is a Vogon Construction Fleet. At least that might be funny.