For some people’s psychological health, and their fear of impending doom/potential responsibility, it is actually easier for many people to believe that global warming is a hoax.
Neglecting global warming avoids potential financial and economic responsibilities as well as a potential life style change.
Also, when the leader of the United States adamantly believes that global warming “was created by and for the Chinese in order to make us manufacturing non-competitive,” it’s easy to take that as reassurance or to blindly follow your leaders sentiments.
It is important to sympathize with people who choose to believe that global warming is a hoax, so that instead of spitting facts at them, we can explore their psychological/emotional feelings.
After sympathizing, it’s important to know, and to tell others what they personally can do to reduce their emissions of toxins into the atmosphere.