In your book, you discuss the idea of optimal climate and how this has been used by economists. Can you unpack that a little bit? I was going to go for the moth effect, but it sounded really boring. So I looked up and actually there's a whole family of hawk moths. And they're from the death said hawk moth, which is probably the most famous one,. Which has a sort of skull on its abdomen. The hawks are more camouflaged than the pictures of the butterfly effect with a really pretty snazzy butterfly.

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