Could heat emissions cause global warming? I have calculated 6×1020J/a World heat production from human combustion, energy capture, waste heat and emissions to be 8.3 times greater than warming of oceans, land and atmosphere observed, but 216 times lower than solar forcing of 0.9 Watts per square metre assumed in a climate model (Trenberth 2009). The human effect is relatively small but cannot be ignored, because it acts like the last straw that broke the camel’s back and could cause global warming. Earth’s heat load is to absorb and radiate and a much larger quantity of heat day and night. That is relatively constant. The anthropogenic heat straws which add to the radiative camel are enough to shift the heat balance of the Earth, causing global warming.