Keep in mind the scale of the experiment we're living in: between the peak of last ice age (when most of today's developed countries were either under a thick dome of ice, or dry cold steppes with roaming hordes of woolly mammoths) and pre-industrial climate, the global temperature increase was only 5°C, occurring over a few millenia (though this increase was enough to destroy completely this environment and its mammoths, wooly rhinos, cave bears, etc).
Now we're talking of adding 4°C in a couple of centuries. What could go wrong, really? Yeah, about everything, and really strong and fast.
People don't worry because they think of having 4°C daily increase temperature, no big deal: temperature swings daily by tens of degrees. But they should instead think of a fever: a 2°C fever is already pretty strong; a 4°C fever is a very serious condition, potentially deadly.
Now we're talking of adding 4°C in a couple of centuries. What could go wrong, really? Yeah, about everything, and really strong and fast.
People don't worry because they think of having 4°C daily increase temperature, no big deal: temperature swings daily by tens of degrees. But they should instead think of a fever: a 2°C fever is already pretty strong; a 4°C fever is a very serious condition, potentially deadly.