Thomas Friedman is right in “The Next Really Cool Thing” in The New York Times, March 15, 2009, when he concludes:

At the pace we’re going with the technologies we have, without some game-changers, climate change is going to have its way with us. Yes, we’ll still need coal for some time. But let’s make sure that we aren’t just chasing the fantasy that we can “clean up” coal, when our real future depends on birthing new technologies that can replace it.

Note that he pointed out ‘the fantasy that we can “clean up” coal.

Friedman also said:

“I don’t know if they can pull this off; some scientists are skeptical. Laboratory-scale nuclear fusion and energy gain is really hard…. we need to keep working on all forms of solar, geothermal and wind power. They work. And the more they get deployed, the more their costs will go down.”

Fusion may be the game changer. “Energy Gain” means we get more energy out than we put in. The prototype will cost $10 Billion – enough for 5 GW of wind capacity, and 1.53 GW of PV Solar. And fusion is at least 10 years away, maybe 20, maybe 50. We know how to build wind and solar. (On the other hand it takes 10 years to build a nuclear fission reactor.)

But pushing carbon below 350 ppm is a problem that can’t wait 10 years.  According to the World Watch Institute’s Vital Signs, 2007-2008, the 6.5 billion humans on the earth are using the natural resources of 1.25 earths.  This can’t go on.