It's just slightly badly worded. They're saying that we won't stop emitting until 2050, so until then we'll be heating, because a given CO2 level (assuming it i

It's just slightly badly worded. They're saying that we won't stop emitting until 2050, so until then we'll be heating, because a given CO2 level (assuming it is static e.g. no feedback) determines an equilibrium temperature. > at net zero, the rate will stabilise should read something like; at net zero [emissions], the temperature will stabilise.