Because of the complexity of the problem, environmental skepticism was once tenable. No longer. It is time to flip from skepticism to activism.

In the past 10,000 years, humans have devised roughly 100,000 religions based on roughly 2,500 gods. So the only difference between myself and the believers is that I am skeptical of 2,500 gods whereas they are skeptical of 2,499 gods. We're only one God away from total agreement.

The actual atoms and molecules that make up my brain and body today are not the same ones that I was born with on September 8, 1954, a half-century ago this month.

Skepticism is not a position; skepticism is an approach to claims, in the same way that science is not a subject but a method.

... In a free society, skeptics are the watchdogs against irrationalism - the consumer advocates of ideas. Debunking is not simply the divestment of bunk; its utility is in offering a better alternative, along with a lesson on how thinking goes wrong.

We want to be open-minded enough to accept radial new ideas when they occasionally come along, but we don't want to be so open-minded that our brains fall out.

No single discovery from any of these fields denotes proof of evolution, but together they reveal that life evolved in a certain sequence by a particular process.