It is critical that the world captures every last bit of energy efficiency, if we are to reduce greenhouse gas emissions enough to keep below dangerous rises in temperature. I am pleased that this important new study shows how information and communication technology can play an essential role in saving energy. Now we need more and effective government policies that reward such action and penalize delayed responses.

We will move to a low-carbon world because nature will force us, or because policy will guide us. If we wait until nature forces us, the cost will be astronomical.

You can rear children in an antagonistic environment or in a facilitative one with a good combination of love and discipline. It's about supporting them, and recognizing achievements and contributions, but also saying, "that's fantastic but it's not enough, here's the next thing."

No architect should design buildings that import a huge amount of energy.

Think global, act local.

This is probably the most difficult task we have ever given ourselves, which is to intentionally transform the economic development model, for the first time in human history.

We cannot ask others to do what we have not done ourselves.