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):