You are either baiting me or being overly pedantic.
Anyway, we didn't stop using fossil fuels so that must mean according to the "top scientist" we are all doomed now, so why bother doing anything about it?
IMO for sure we ain't going to stop using fossil fuels till the crude runs out, and then we'll liquefy coal.
IMO climate change isn't going to wipe us out , but our pollution, environmental destruction and overpopulation will.