Is it true this is the consensus of the whole world?
It seems to be the consensus of a portion of the scientific establishment, which is certainly not representative of the whole world.
And, if, for sake of argument, we grant this scientific consensus represents the perspective of the world, it still does not follow this somehow precludes faulty reasoning and groupthink. "Science" is not a magic wand that automatically eliminates the normal sources of human bias, especially as recent news illustrates the rampant fraud and unreproducible results in the scientific establishment.