The IPCC is a collective group of scientist built into multiple work groups to study vast amounts of data sets. They are climatologists, meterologist, biologist, marine biologist, etc.
This who’ll not “scientific” statement is used by many extreme right wing who some have been unconvered as working for exxon and other major oil companies.
It is extremely apparent that we have started to outgrow our planet, have polluted it to an extreme and are now suffering the consequences.