Put a percentage on it. I'm interested to know how certain people are either way.
People see the compelling body of opinion, consisting of the most respected and pre-eminent scientists and scientific bodies in the world - and they're initially convinced. But then they look at the other side. These scientists could be in it to gain extra funding. Governments could be pushing this theory to raise green taxes. And there are a significant number of scientists (not as many admittedly, and not as respected, some argue) who argue against the idea of man-made climate change.
So let's say this combination of opposing voices and suspect motives have eroded your belief in man-made climate change. So you're only 50/50. Or even 70/30 in favour of not believing. That still leaves a very hefty chance in your mind that we're responsible in some way for potentially catastrophic change.
Surely those odds would be enough to make you take the chance - even if on the balance of probabilities you don't believe it's happening - that there might be something in it, and be prepared to change behaviour, pay more tax, take responsibility accordingly.
If you reduce your carbon footprint and it turns out you've been duped, what's the worst that's happened? You're slightly less well-off financially, you feel a bit of an idiot. If you do nothing and it turns out you should have, what's the worst that's happened? You've contributed to irreversible and hugely damaging climate change. That's the bit I don't get.
So how certain are non-believers that man-made climate change isn't real? And what is it about the believability of the conspiracy theories that overrides the believability of so many thousands of highly respected scientists?
Even if ON BALANCE you're not sold on the idea, the cast-iron certainty that it's not true worth acting on AT ALL seems odd to me.