The climate is getting worse. By any measure one would care to use. What has been decided, and what the world has decided to do (3 countries didn't sign on to the Paris Accord), some states more intently than others, is put into place measures that will prevent it getting a lot worse.
The consensus of scientific specialists on this matter is often noted as being 97%.
The 97% consensus on global warming
It's now one tenth of 1% away from being unanimous.
‘Case closed’: 99.9% of scientists agree climate emergency caused by humans
Your chum Christy is finding himself marginalised to an ever greater extent.
But let's stick with 97% at the moment. And let's say that a local bridge over which you need to drive has been examined by 100 structural engineers. And 97 of them say, quite definitely, that it's likely to collapse if you drive over it. What do you do? Try to find one of the guys who says it's safe? And then based on what he and his 2 chums say, do you ignore what the other 97 say and drive over the bridge anyway?
Only a fool would do so.
And just a quick heads up...please don't respond with any facts and figures that you might have found that people like Christy have come up with. This subject has been done to death. The jury is in and I'm not the slightest bit interested in debunking the same ol' same ol' yet again.