It would be pretty awesome if anthropogenic global warming is true. First, it would mean man is powerful enough to effect the climate. This is very good news in a world where a very serious volcanic event or meteor strike can cool the globe for decades. Second, it would likely increase the carrying capacity of earth, as it would open up vast areas of Canada and Russia for agriculture. Warmer periods in Earth's history were characterized by much more abundant life, with plants reaping many benefits from increased CO2 levels. We should hope we could move the Earth back in that direction again.
Any notion that Earth would turn into Venus or otherwise completely uninhabitable are not too serious. The vast difference in solar insolation and atmospheric density makes this highly unlikely. And if the warming began to threaten humanity, we already know many ways to cool the climate that would actually cost less than the pointless carbon taxes being proposed.
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