A delightful analogy for the worst sort of climate change agitation:
Let us use, instead of a child with cancer, a happy little puppy dog. Somebody presents themselves as an expert, and tells you that the puppy dog is terribly, terribly sick. But you look at the puppy, and to you it seems to be perfectly normal. It wags and chases its own tail. It investigates every new object and smell, runs around, eats a bit, and falls asleep. You challenge the expert. He says that unless you do as he says, according to the computer model of a puppy he has devised, the real puppy will die in a horrible, horrible way, and it will all be your fault. Do you want to be a puppy murderer?
Whatever the truth of climate change, this does sum up so much of the debate.