Climate change is like an asteroid on collision course with earth

Renowned climate scientist James Hansen has a TED talk out. Low key, but very scary:

”Imagine a giant asteroid on a direct collission course with earth. That is the equivalent of what we face now. Yet we dither, taking no action to avoid the asteroid, even though the longer we wait, the more difficult and expensive it becomes. If we had started in 2005 it would have required emission reductions of 3% pr. year to restore planetary energy balance and stabilize climate this century. If we start next year, it is 6 % pr. year. If we wait ten years, it is 15% pr. year – extremely difficult and expensive, perhaps impossible. But we aren’t even starting. So now you know what I know, which causes me to sound this alarm”.