There seems to be a general consensus that the Earth is in radiative imbalance, i.e., it is absorbing more solar energy than it radiates. One figure I've seen bandied about for this imbalance is that it is about +0.6 W/m2 averaged over Earth's surface.

We also have a fairly good grasp of the various radiative forcings influencing Earth's climate, with a sum total of something like 2.2 watts per square meter. These forcings are measured relative to 1750, i.e., the Earth is effectively receiving 2.2 W/m2 more than it was in 1750 due to these effects.

Does this mean that the Earth was losing net energy in 1750, at a rate of 0.6 W/m2 - 2.2 W/m2 ≈ -1.6 W/m2? If so, does this imply that the Earth was not in radiative equilibrium in pre-industrial times? Was it cooling off?

Or have I misunderstood some important ideas in here, and this this is too simplistic of a way to look at things?