You look at things you enjoy in your life, but much more important is what you can do to make the world a better place.

I grew up around books. When I first held the book and it was a substantive, tangible thing, and I thought of all the work that went into it, not just my work but everybody else's and the research and so forth, there's a sense of really have done something worthwhile.

Sometimes it's very difficult to find fresh fruit on the road.

In global warming, I think everyone is scratching their heads - are there technological things that can be brought to bear that can make a difference?

As a species, we've always been discoverers and adventurers, and space and the deep ocean are some of the last frontiers.

The possible is constantly being redefined, and I care deeply about helping humanity move forward.

With documentary-film projects, you hope you highlight an area of concern people haven't thought about before. A lot of times, I'm asking myself - 'This seems to be a significant problem. What can be done that hasn't been done?