I know that the Earth goes through natural warming and cooling cycles. I'm willing to concede that that we're in one of those epoch warming cycles, right now. "Greenhouse gasses" in the atmosphere still raise temperatures in local climates. That's been proven through repeatable scientific experiments, several times (such as the fact that American major cities' temperatures are consistently 2-3 degrees F warmer Monday through Friday than they are on the weekends, due to all the cars on the roads).

I also know that cholestorol levels are based, in part, on a person's natural, genetic make-up. But if you're one of the folks who have a family history of high cholestorol levels, I doubt a responsible doctor would say: "Don't worry about your diet. Go ahead and eat all the cheese burgers and deep-fried pork rinds you want, 'cause having fat in your blood is natural for you."

And yes, 30 years ago, the prevailing scientific worry was that the Earth's climate was cooling. ... So more scientists set out to study the atmosphere, and not take it for granted. They discovered that it's warming up, instead. And the more we learn, the more we can refine the experiments, and the more accurate predictions we can make. Just look at your everyday weather forcast on the evening news. A few years ago, any prediction beyond three days into the future was wild guessing... Now, a week's forcast is standard, and more accurate than the three-day forcasts of years ago.

Science -- it's not just for ivory towers, anymore.