Urgency and vision are the twin pillars on which humanity's hope now hangs.

Improved energy productivity and renewable energy are both available in abundance—and new policies and technologies are rapidly making them more economically competitive with fossil fuels. In combination, these energy options represent the most robust alternative to the current energy system, capable of providing the diverse array of energy services that a modern economy requires. Given the urgency of the climate problem, that is indeed convenient.

The 1,230 gigawatts (GW) of renewable power generating capacity in place at the end of 2009 now constitutes just over 25 percent of total generating capacity worldwide. This is over three times nuclear generating capacity and roughly 38 percent of the capacity of fossil fuel-burning power plants worldwide.

Building a world where we meet our own needs without denying future generations a healthy society is not impossible, as some would assert. The question is where societies choose to put their creative efforts

The challenge now is to renovate the baroque structure that the Kyoto Plan has become—or else scrap it and get ready to start all over.

Within a few decades...the United States might get 30% of its electricity from sunshine.

The bottom of the oil barrel is now visible.