I would hope that most of you will in fact strive for leadership in a principled manner with values, because that would be the foundation that this country needs to have if it is to take its place in the world. I would hope that each of you would lead by example and that each of you would live by the principles that you espouse.

I think fear and fear of the unknown and perceived failure is what holds people back. For me, I am more scared of complacency than having something not work out. I'd rather take a leap of faith and fall than stand on the edge forever.

One thing I state as soon as we’re out of the door: ‘Under no circumstances is anyone to say that I lost a battle with cancer. Or that I bore it bravely. I am not fighting, losing, winning or bearing.’ I will not personify the cancer cells inside me in any form. I reject all metaphors of attack or enmity in the midst, and will have nothing whatever to do with any notion of desert, punishment, fairness or unfairness, or any kind of moral causality.

Get on with it. But make sure you do want to do it. I think that’s the important thing, to be something that you would enjoy. If you only just go into science to get rich or to win gold medals, then I wouldn’t bother, but if you really want to enjoy yourself in the lab, then do it.

It was probably a series of biographies of scientists like Pasteur, or even earlier ones — Leeuwenhoek inventing the microscope and Madame Curie. I forget how many others, but it was really just, for me, a fascination to learn about these great heroes. At that time, of course, they were totally inaccessible, almost non-human, to me. It became very interesting to me.

In terms of this issue of these industrial gases affecting the environment, at the beginning the road was not easy, because we were suggesting that society had to change, that industries had to do something different than they were doing at that time. And of course, initially we did not meet with a good reception to these ideas from industry. And even from the scientific community — even though our ideas were well received in the small group of specialists in what we were doing — it was not necessarily well received by the scientific community at large. So we really had to continue doing as good a science as we could, and at the same time trying to well communicate our conviction that it was something important, something that had to change in the way society was functioning.

So achievement, to me, is something that just comes with this attitude of doing your work the best you can in a passionate way. It’s not something that you have to expect. It’s something that’s a consequence of what you do, but it’s certainly important.

there are really very many. Again, as a child, it was obviously those scientists which had lived in the past that had made such an important mark in science history.

At first the research did not seem to be particularly interesting – I carried out a systematic search for processes that might destroy the CFCs in the lower atmosphere, but nothing appeared to affect them. We knew, however, that they would eventually drift to sufficiently high altitudes to be destroyed by solar radiation. The question was not only what destroys them, but more importantly, what the consequences are.

I have also benefited from teaching; as I try to explain my views to students with critical and open minds, I find myself continually being challenged to go back and rethink ideas. I now see teaching and research as complementary, mutually reinforcing activities.