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Imagine how many aspects of nature we would miss if we lived on the surface of the sun. Without inventing refrigerators, we would only know gaseous matter and never observe liquids or solids, and miss the beauty of snowflakes.

When I was a kid, we never heard of smog, ozone depletion, acid rain, green house gasses.

When I was growing up, I installed refrigerators in supermarkets. My father was an electrical engineer.

I had never been in a supermarket before coming to America. At home, my parents wouldn't let me open the refrigerator, because they worried I'd damage the door by opening it too many times.

I see a future where getting to work or to school or to the store does not have to cause pollution.

Climate change and ozone depletion are two global issues that are different but have many connections. In the ozone depletion case, we managed to work with decision makers effectively so that an international agreement called the Montreal Protocol was achieved that essentially solved the ozone depletion problem.

It's absolutely stupid that we live without an ozone layer. We have men, we've got rockets, we've got saran wrap - fix it!

Back in the '70s - I remember the '70s: we were told there was global cooling. And everyone was told global cooling was a really big problem. And then that faded.

When you have energy companies like Shell and British Petroleum, both of which are perhaps represented in this room, saying there is a problem with excess carbon dioxide emission, I think we ought to listen.

In the 1970s, the scare was about global cooling.