Realistic' is a loaded word for me. Anyone who uses the word 'realistic' is all bad.

There is no business on a dead planet

True wilderness is where you keep it, and real wilderness experience cannot be a sedentary one; you have to seek it out not seated, but afoot.

Keep your rivers flowing as they will, and you will continue to know the most important of all freedoms-the boundless scope of the human mind to contemplate wonders, and to begin to understand their meaning.

If you want to get people off drugs, improve reality.

Once we open the door to the plutonium economy, we expose ourselves to absolutely terrible, horrifying risks from these people.

We cannot go on fiddling while the earth's wild places burn.