Here's a great post I saw at another forum.
Global Warming: Snake Oil for the 21st Century
The huxter stands on the platform, his straw hat tilted at a jaunty angle and his cane in hand. His song and dance are eerily reminiscent of Harold Hill as he waves to the curious onlookers.
"You got trouble, my friends!" he shouts, "Trouble right here on Earth! The Rainforests are vanishing at the rate of millions of acres a day, and global temperatures have gone up a whole degree in the last century alone, and the polar icecaps are melting! There's a hole in the ozone layer, and it's growing every day, and cow flatulance is building up to dangerous levels in the upper atmosphere!"
Warming to his subject, he goes for the jugular "The whales are all dying! Every nuclear power plant on the planet is a potential Chernobyll (Need I even mention 3-mile island?) I tell you, my friends, greenhouse gasses are out of control! Humans generate a billion times more greenhouse gasses now than we did two hundred years ago! All of this is verified by genu-wine scientists with actual college degrees! Your only hope is to buy my Kyoto Miracle Environmental Youth Elixir!"
A small voice near the front of the crowd mutters "Which scientists? And what are their degrees in?" but it is ignored in the furor.
Let's look at some facts before discounting that little voice.
For many years, we've been told the rainforests (AKA Jungles) are "vanishing" at some ridiculous rate, but they're still there, and not much smaller than they were before. (The truth: Jungles grow back faster than humans have been cutting them down.)
We're also told that the global average temperature has gone up in the last century. Now do we know this? We didn't have the technology or the desire to go around measuring worldwide temperatures in 1901, so how can anyone say with certainty that there's ANY sustained trend up OR down in world temperatures? In any case, we've just come out of a mini ice-age that occurred in the middle ages. When you come out of an ice age, do you expect temperatures to go up or down?
Similarly, the so-called "Ozone Hole" (which isn't a hole at all, but a slight thinning in the polar regions) is the result of satellite observations (Impossible prior to the 1970s), so how can anyone tell that it hasn't ALWAYS been there?
There was a man who made millions of dollars claiming that the polar icecaps would melt by the year 1997 and half the dry land in the world would be underwater. He sold maps of what the world was supposed to look like and books, and made a bundle before his hypothesis was revealed to be completely wrong by the passage of time. Fortunately for him, everyone basically ignored his previous predictions and he was not publicly proclaimed to be a fraud. His biggest success was inspiring the movie "waterworld" to move his deadline forward twenty years or so.
The whole Icecap thing is just silly. Even counting ALL the ice in the icecaps, sea level would rise a grand total of perhaps twenty inches worldwide (Keep in mind that the North Polar icecap would have ZERO effect on worldwide sea level if it melted, since all the ice there is floating, and displaces the same volume whether it it liquid or solid (even Archemedes knew this), and only ice that is currently ABOVE current sea level in the south pole (and not even some of that) counts.)
The latest craze in the environmental alarmist handbook (which used to claim that all the smoke generated by the industrial revolution would plunge us into an ice age) is "Greenhouse gasses"...everything from cow flatulance to cigarette smoke is touted as contributing to "Global Warming (tm)" which (if you believe the hype) will reduce the entire planet to uninhabitability quicker than you can say "Bob's your uncle."
Now let's put this in perspective. All the greenhouse gasses generated by the sum total of all human activities for an entire year fall short of the total generation of the same gasses generated by the volcanic activity on Earth in a single day, even a day that isn't particularly active.
Let me tell you a true story...Around the turn of the century (look it up if you like) a new scientific test was performed on a comet that would pass near the Earth. It had been noted that Earth would pass through the comet's tail, so some scientists used new methods to determine what the tail consisted of. Among other things, they detected traces of Cyanagen, a poisonous substance. Despite the fact that the concentration was tiny, an entire industry sprung up selling "Anti-Comet" pills and gas masks. Ill-educated and poorly informed people listened to the opportunistic prophets of doom, who separated them from their cash in a frenzy of panic and confusion caused by a profusion of snake-oil pitches.
Sound familiar? Don't trust MY word...do your own research and find out what's really going on! Read about the 10,000 page scientific report that said, basically "We don't know if there's any such thing as Global Warming going on, or if human activity has any detectable effect on global climate", of which some radical environmentallists wrote a 10 page "summary" that said "There is DEFINITELY Global warming, and we have to do something about it RIGHT NOW!"