Does any sane person still believe in man-made global warming?

Scientists discovered long ago how certain naturally occurring chemicals behave in the atmosphere, and how they affect the climate and temperature, and how they can drive the natural warming/cooling (ice age) cycles. So, if we are dumping tons of these chemicals into the atmosphere through pollution, then common sense should dictate that yes, we are affecting that natural cycle, and throwing it out of balance... Hence, man-made global warming.