Scott Adams writes:
Now suppose the Earth’s temperature was already in the good range for humans, but it was getting even better according to a natural cycle. That better temperature would – I assume – increase human activity in ways that (wait for it) contribute to CO2. If the economy is good, we build more industry and create more CO2. If the causation works in that direction, the heat of the world and the CO2 levels would be correlated. But the cause in this scenario is the warmth, not the CO2.