Because some people don't understand how an earth warming cycle looks I have included a highly technical schematic as part of my blog today.
On the top line of the drawing we are looking at a warming and cooling trend on the earth that has a period of around 20,000 years. While my drawing isn't based on specific data this is pretty much what it looks like. You can find the real 12,000 year span on Wikipedia.
The second line is a magnification of one 10,000 year section through which time we cycle down to a cool era and are heading up. This is what we call an ice age. Not a "little ice age." A full blown ice age.
The third line represents a 2,500 year time span and when you get this close to the data it gets much harder to figure out what is going on.
I then drew a one hundred year stretch with a very steep upward trend. The real data shows a very steep upward trend, changing higher upwards than anyone has ever seen since the last ice age. The problem is we can't reconstruct the data going any further back. So it leaves people guessing what is going to happen. People who are convinced that humans are the cause for this trend jump up and down swearing that the curve will go up forever, swamping all of the the world's low lands in the process.
My undergraduate is in Geology and a student once asked the professor if he believed that there was global warming and if we were causing it. He pointed to the same data I layed out and then sidestepped the issue by pointing out that whether or not you agree on the cause, man is running a global science experiment. We are converting all of our fossil fuels into Carbon dioxide, heat, water, and a few other nasties. So, whether or not you agree that man is the cause, the data shows a phenominal uptick in the OVERALL global temperature.
Being a geologist and used to thinking in terms of Millions...and Billions of years, I personally think that even if we humans are supplying our inputs, our impact or even a major change in our behavior will not change what the earth has done forever. And that is be a huge chemistry lab where oxygen, carbon dioxide, and water are the main chemical reactants.
Anyone that claims catagorically that man is the main cause for global warming has left the realm of science and entered the realm of politics. A realm that in order to look like a hero, you've got to create the problem you are going to solve first.