If all energy degrades to heat then there would be no net gain in atmospheric temperatures .
DENIER! /s>
The problem is, there is still the same amount of heat coming into the system from the sun, so no net warming.
BUT there 6 billion people, which makes Mother Gaea so crowded that they ae forced to rub against each other, and that releases anthropogens, which also degrade to heat. That's why it is called "antropogenic global warming"! /S>