If it is, then we have to take drastic measures to avoid it, and that includes shutting down most fossil fuel power plants.
And this widely held belief is the reason why many people who *know that man-made climate change is real* deny it anyway.
Drastic action may or may not be a good idea, and the advantages need to be carefully weighed against the disadvantages. Modern industry *runs* on fossil fuels, and we can't just shut that off. Remember - food production at a scale that can actually feed everyone is only possible today through fossil-fuel based industrial methods.
If your plan is to develop and promote cleaner technologies, awesome. If it's to ban tractors, then you're on the wrong team.