Have you ever looked at a CO2 concentration in the Atmosphere VS Temperature curve? Yes the earth does have natural increases and decreases in temperature but the rate this change is happening today is anything but natural. How can this be though, if warming and cooling happens in a neat cyclic fashion as you make out?

I'll tell you the answer global warming, which in its most basic form is caused via emission of CO2 to the atmosphere, which in turn traps more heat and warms the earth...... Thats a very simple explanation but you sound like an intelligent guy so I'm sure you've caught on
