 Liz Hanna, in the business press, major corporations and economists worry a lot about worker productivity. They tell us productive workforce, that's the key, yet they don't seem to worry about global warming at the same time. Are they missing something? Absolutely. And this is the focus of a good deal of the work that I'm doing at the moment. That's actually looking to see what is the human thermal tolerance. I mean, obviously I'm Australian and my work is focused on Australia at the moment, but it's part of a global project.