Climate change denial. The key word there is denial.
It is far to hurtful to accept that "we" as humans cause climate change through the use of fossil fuels. So "we" employ denial so we can continue with our use of fossil fuels and feel good about it. It is just too painful to consider that we need to reduce fossil fuel usage fast and by a large amount.
Just like Brexit denial. Otherwise known as Project Fear. Albeit Project Fear was true with Osborne and Cameron in charge of the remain campaign
The other defence mechanism that will kick in when everything goes to shit is projection. Brexiters will blame anyone but themselves when it all goes to shit.
Every crap part of history is basically caused by people telling themselves lies so they can feel better than "other" people or groups, or the world turning to shit around them.
It is hard for me not to despise the human race on some mornings when I wake up. Then I realize that not everyone is a bad egg.