DO you have a source for this? I cant't find something for 2400, but from https://en.wikipedia.org/wiki/Representative_Concentration_P... the prediction of the IPCC for 2300 is an increase of 3.0 to 12.6 °C that is really bad but by far not enough to start boiling the oceans.

The article shows that 2.3% is an extreme upper bonnet because humanity has already lost its need of ability to generate 2.3% more growth per year. It's another case of people looking at a logistic graph and pretending it's exponential

that's the underlying theme of the series - it shows that exponential growth of economy is tied to exponential growth of energy consumption and it's something economists can't quite wrap their heads around.