Is Global Warming True?

I’m not sure I believe ‘Global Warming’ due to humans is true.  I believe that us burning the fossil fuels at the rate we do causes the air we breathe to be more dirty.  I believe that the temperature of the Earth is more on its own cycle, than the current rise in average temperatures to be our fault.  To prove my thinking, think about the Ice Age…there could not have been anything that the Dinosaurs were doing to make everything freeze over.  Also, read this short article from the May 2009 Popular Mechanics magazine:

“An international team of scientists has uncovered the fossil of a 60-million-year-old snake that weighed 2500 pounds and was more than 40 feet long.  Aside from the creep factor, this is significant because the maximum size of cold-blooded animals is determined by temperature.  The size of the Titanoboa cerrejonensis indicates the South American topical forest had average temperatures of about 90 F - more than 10 degrees hotter than current norms.”

Now what do you think?