Curious: for the latter I get 7e21 J, using Wikipedia's normal-insolation figure of 947 W and its Earth albedo of 0.3. That's an order of magnitude greater. I'm probably missing something, do you have a source?

(Of course my figure would only increase the difference you're pointing out.)

Indeed we are 2–3 orders of magnitude away from the point where our energy output itself non-negligibly, globally heats the earth. And if we kept growing, an incandescent Earth would not be too far off. There are hard limits.

This does not take into account that the planet was in balance before human activities has started impacting it. Plus earth reflectivity is decreasing due to human intervention e.g. deforestation.