The belief of climate change deniers is usually unshakable, like that of the flat-earth believers or Holocaust deniers. Many delude themselves that there is a conspiracy.
Climate change delusion is dangerous to humanity, for it overtly or deviously prevents effective reduction of greenhouse emissions by governments in many countries, including the US and Australia, but is an increasing problem with the rise of right-wing governments in Europe and South America, including, Brazil where the new government has a foreign minister devoted to climate denial.
To the denier, there is no climate change — so coal is clean, coal is good, coal is cheap, it is our duty to export it to the poor of the world to give them electricity.
The good news is worldwide opinion and protests are growing to brush the dangerous flat earthers aside.
