Cook: "When someone mentions to you that CO2 lags temperature, remind them they're actually invoking evidence for a positive feedback that further increases global warming by an extra 15 to 78%."

Physicist John Cook of Skeptical Science has a good piece on "The significance of the CO2 lag" that I'm reposting here, followed by a discussion of the best-studied feedbacks and their likely impact (with links to the literature).

When we examine past climate change using ice cores, we observe that CO2 lags temperature. In other words, a change in temperature causes changes in atmospheric CO2. This is due to various processes such as warmer temperatures causing the oceans to release CO2...