Thatch to the Future(NaN)

When participants at a climate conference in 2033 fail to agree on anything, chief negotiator GERTA (not Greta!) explodes and suggests, "The only thing you could agree on is to go back in time and get the people THEN to fix the problem." The sarcastic outburst is accepted as a rather wonderful idea, only for Gerta to reveal that they actually have access to a time machine.