I don't have the illusion that there's any position or role in the world with as much potential for bringing about change as that of president of the United States.

The moral imperative to make big changes is inescapable...that what we take for granted may not be here for our children

At some point, a false belief collides with physical reality.

The consensus is clear. We need an immediate and determined shift to a clean, renewable economy. The continued mass burning of fossil fuels is inconsistent with a healthy, prosperous future for our civilization.

George Orwell once wrote that a false belief sooner or later collides with physical reality, usually on a battlefield.

Third world nations are producing too many children too fast...it is time to ignore the controversy over family planning and cut out-of-control population growth.

What we take for granted might not be here for our children.