Any astronaut can tell you you've got to do everything you can to learn about your life support system and then do everything you can to take care of it.

The ocean governs the climate and the weather, it is taking care of the temperature and it is shaping the chemistry of our planet.

There's a vested interest in trying to keep people smoking cigarettes.

I am not in any hurry to grow up.

For humans, the Arctic is a harshly inhospitable place, but the conditions there are precisely what polar bears require to survive - and thrive. 'Harsh' to us is 'home' for them. Take away the ice and snow, increase the temperature by even a little, and the realm that makes their lives possible literally melts away.

Childcare is a huge issue for young women whose work may require them to leave their families for weeks at a time.

The concept of 'peak oil' has penetrated the hearts and minds of people concerned about energy for the future. 'Peak fish' occurred around the end of the 1980s.