Earlier in this century, the Heisenberg Principle established that the very act of observing a natural phenomenon can change what is being observed. Although the initial theory was limited in practice to special cases in subatomic physics, the philosophical implications were and are staggering.

I am a passionate advocate of getting special interest money out of politics.

Of all the works of civilization that interfere with the natural water distribution system, irrigation has been by far the most pervasive and powerful.

A leapord never changes his stripes.

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

It's not unusual to find big political shifts that take place beneath the surface before they're visible above the surface.

Researchers at the Naval Postgraduate School have told us that the entire Arctic ice cap may totally disappear in summer in as little as five years if nothing is done to curb emissions of greenhouse gas pollution.