That YouTube clip is a little outdated. If this were something that America alone was responsible for, we'd be on a better path.

http://www.abc.net.au/news/stories/2008/09/26/2375125.htm

The United States has taken steps to reduce carbon emissions, and they are no longer the worst offender.... not to say they didn't make an enormous contribution to the problem. Right now, developing countries are the worst offenders, and they are on the same industrial path the US was on in the first half see more of the 20th century.

Personally, I think the path the world is on is irreversible. China has become a huge industrial machine, and the inertia of that machine is going to be exceedingly difficult to overcome. The same goes for a few other top polluters.

Geologically speaking, the time that humans have been inhabiting this planet, is only a blink of the eye.... the time that human have been polluting, is far, far, less than a blink of an eye...... that's the scary part.