Most people, even those who believe in global warming, are still caught up in thinking it's about losing shore towns in Florida, or more hurricanes and tornadoes.
That's the least of it. Take a look at this crude map that I colored in:
The yellow areas, population a couple of billion, are areas on track to have temperatures so elevated that their agricultural base will be essentially destroyed, displacing most of their people.
By comparison, the displacement of ten million people in Syria, half still inside the country, has caused near fatal political and economic damage throughout Europe, and is a key factor in the re-emergence of the ugliest strains of nationalism in a number of countries, most notably in the United States, far from the immediate problem. If what I describe above takes place (and please remember that, at every stage, the predictions about global warming have inevitably been less than what has actually occurred) it will basically destroy civilization in Europe, and cast the entire world into an economic disaster far beyond what happened in the Great Depression.
But no, global warming is just a dirty trick by liberals. God forbid we should have to spend any money, or inconvenience ourselves in any way, dealing with it.