The last overall static's I have heard with in the past week with regard to green house gases is that we as the human population, contribute only 4% of the overall co2 into the atmosphere, and that included us breathing. (source talk radio)
Overall, Volcanoes erupting, organic material decaying produce more "Green House" gases than we do.
I feel the overall need for people to feel they can cause planetary disaster is one major fact that drives this theory.
Temps are going up?? Temps are going down??
How long has the people of this world been keeping track of the weather? I will give you 500 years, and I doubt it has been that long. Now, how long as the planet been around? Just as an example, lets go back 1 million years

How much data do we really have for an actual trend analysis? 500/1000000 = 0.0005% People say the planet has been around 50 million years… ok... 500/50000000 = 0.00001%
How can we really know anything with regard to what this world is doing because of us?