Do thermometers lie?
Worst case scenario if we believe climate change is true. We spend a bunch of money and convert our energy sources to renewables, creating millions of new jobs, new technology and most likely, a cleaner world that is more locally controlled and nothing happens to the climate.
Worst case scenario if we don't believe climate change is real, we do nothing, continue polluting the planet and the govs own numbers come true, millions of people die, millions of people starve to death and we spend 10 times more money than we would have if we had just listened.