When we respond to threats immediately and take action right away, it's usually the threats that we're hard-wired to respond to, the kinds of things that our ancestors survived.

The catastrophe now threatening us is unprecedented - and we often confuse the unprecedented with the improbable.

Population growth is straining the Earth's resources to the breaking point, and educating girls is the single most important factor in stabilizing that. That, plus helping women gain political and economic power and safeguarding their reproductive rights.

Our insatiable drive to rummage deep beneath the surface of the earth is a willful expansion of our dysfunctional civilization into Nature.

The existence of the EPA regulation will require large carbon polluters to look at their hole cards, and some of them have decided that they much prefer legislation.

The conversation on global warming has been stalled because a shrinking group of denialists fly into a rage when it's mentioned.

If you allow someone like Saddam Hussein to get nuclear weapons, ballistic missiles, chemical weapons, biological weapons, how many people is he going to kill with such weapons? He's already demonstrated a willingness to use these weapons. He poison-gassed his own people. He used poison gas and other weapons of mass destruction against his neighbors. This man has no compunction about killing lots and lots of people. So this is a way to save lives and to save the stability and peace of a region of the world that is important to the peace and security of the entire world.