This week’s Nature has a commentary by Roger Pielke Jr et al that question the IPCC’s assumptions of how much stabilization of greenhouse gas levels will occur automatically through technological advances, without additional climate-change policies. They argue that the IPCC’s reference scenarios assume too much stabilization of emissions through technology alone, which could lead to climate change policies and other measures that won’t be aggressive enough to effectively lower emissions.

Accompanying this is a news article that gives responses from other prominent people in the field, including some IPCC folks. Some agree with the commentary and some don’t.

Read through the articles and post your responses here. Do you agree with the commentary? What sorts of policies will we need to deal with rising greenhouse gas levels?