Hi Phil

I did not actually explain the melting of the last ice age: that is still underway: I asked you to explain the 3 previous meltings, where anthropocentric CO2 cannot be a factor. Still waiting for an answer to that one.

Here is a more recent graph which shows the point where CO2 reached 400ppm in 2016: we seem to be seeing a diminishing rate of return for warming, but we should expect that: Beer’s Law says the warming due to the first 20ppm is the same as for the next 400ppm:

The warming factor of CO2 is proprtional to the log of the concentration.

So I am back to looking for another candidate to explain the warming: Human-generated CO2 no longer works as an explanation.
Without Human fossil-fuel combustion, the current ice age would still end, and we would still need to adapt to higher temperatures.