Just out of curiousity, do you think this "Global Warming" could be a natural cycle that may have been repeated several times or even hundreds of times or even thousands of times in geologic history? Hard to know since the first mercury thermometer wasn't invented until 1714 by Gabriel Fahrenheit. WOW! we have been accurately measuring temperature for 293 years. That is a long long long time in geologic history! Historic accounts provided by some climatologists seem to suggest that there are recurring changes in climate. Oh well, just a little ditty.
I think global warming is just one cycle in a planet wide history of climate variations. It has been coldern and warmer many times throughout history. The current climate has been warming since the last ice age for 15,000 years ago when NYC was under 500 feet of ice.
Where I am not convinced is that human activity is the primary or major cause of a supposed recent warming trend. Nor am I convinced that scientists can measure with any certainty the future of earth's climate.