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

'Green' issues at last are attracting serious attention, owing to critically important links between the environment and the economy, health, and our security.

It's taken us a short time to change the nature of nature. In my lifetime, more change than during all preceding human history put together.

If you make the choice to just go with the flow, that is a choice to make a difference in a negative way.

We want to think of ourselves as truly special creatures that are unique in the universe and, well, we are. And we have that capacity to wonder, to question, and to see ourselves in the context of all of life that has preceded the present time, and all that will go off far into the future, one way or another.

There's plenty of water in the universe without life, but nowhere is there life without water.

Eating wildlife is probably not the smartest thing that we can do in terms of maintaining the integrity of natural systems.