Theodore Roosevelt

Forests are the lungs of our land, purifying the air and giving fresh strength to our people.

The clearing of the forests has been one of the chief factors in bringing on the droughts and floods.

Wilderness is a resource which can shrink into non-existence.

Our duty to the welfare of the future is to pass on the complete heritage of this country undiminished and enriched.

The love of nature is a joy that increases with age.

In wildness is the preservation of the world.

The great outdoors is a great tonic.

To be in the presence of great mountains is to feel humble.

The bison are almost gone; the elk are nearly exterminated.

Every American should be a conservationist.

Water is the most precious resource on earth.

The bird is the most perfecter of the forest.

Nature is a harsh mistress, but she rewards the bold.

The true lover of nature is the man who goes out to study her, not to exploit her.

I wish to preach, not the doctrine of ignoble ease, but the doctrine of the strenuous life.