As John Schellnhuber, one of the biggest European climate scientists that has been part of the majority of IPCCs, said last year about COP:
“Wenn die Länder die Klimaziele nicht umsetzen, sind diese Konferenzen nur Jahrmärkte der Eitelkeit.”
Translation by Google:
“If countries do not implement the climate targets, these conferences will be nothing more than vanity fairs.”
Interview, where he said it, and also said that 3 degrees above pre industrial would mean the end of modern human civilization (in German):
People won’t like it, but 2°C is dying somewhere remote and the ambulance hasn’t been called yet. Even if doctors were around now, it’s unsure if it could be saved.