As world leaders prepare for October 31’s COP26 climate summit, AFP Fact Check examines a number of current allegations concerning the existence of man-made global warming.
Some denounce the crisis as a hoax by scientists to justify their research funding, or even as a conspiracy by governments to control the human population.
If so, it would have to be an extremely complex matter co-ordinated by successive governments in dozens of countries with an enormous number of scientists.
Tens of thousands of peer-reviewed studies of public domain have resulted in an overwhelming scientific consensus that anthropogenic global warming is real.
The Panel on Climate Change (IPCC) is not the largest such source.
As evidence has emerged that unusual warming is taking place, some skeptics acknowledge that it is, but deny that that is due to carbon emissions that man has caused when burning fossil fuels.