to keep alive the prospect of limiting global temperature rise to 1.5 degrees.

The fucking 7 degrees per doubling of CO2 is the biggest fucking okey-doke out there. You need ridiculous positive feedback for that to happen- but also positive feedback delayed by decades. It's more like 0.3 C per doubling without positive feedback and we probably have negative feedback (while clouds do generally make land warmer, most of the world is ocean, ocean has insanely low albedo, more heat, more water evaporates absorbing more heat, rises, condenses into clouds releasing the heat that it absorbed when it vaporized, now all that heat is above half of the atmosphere's CO2 so more heat is lost to space and as a bonus clouds have high albedo so they reflect more light so even more heat is lost to space). More heat means more cooling which means negative feedback; the oceans are giant heat pipes. The idea that clouds over land are going to matter at all is ridiculous because there's so little land compared to ocean (especially in the tropic where this effect is strongest).

And if it's 0.3 degrees per doubling we literally couldn't increase temps by 1.5 if we tried. Maybe 1.0 degree in 200 years if the oceans don't absorb most of the extra CO2 (which they will).