[pier25]

> We're not at equilibrium temperature for our current CO2 levels; if you stopped generating CO2 at an industrial scale and we kept the atmosphere to 420ppm CO2, you'd still expect to see the mean global temperature rise

Exactly.

We're really in uncharted territory. The IPCC et al can show the results of models etc but nobody really knows how bad things are going to get, even if a miracle happened and we reached zero emissions today.

Last time the Earth was above 400ppm of CO2 was during the Pliocene Epoch (2-5 million years ago). Temps were 2-3ºC higher and sea level was about 30 feet higher. We're now at about 420ppm and rising.