Our changing Earth/

Canby, Thomas Y.

Our changing Earth/ Thomas Y. Canby.-- editor. -- Washington: National Geographic Society, 1994.
200 p.: col. ill.; 25 cm.

Includes index.

0870449109


Environmentalism.
Environmental degradation- Citizen participation.
Nature- Effect of human beings on.
Conservation of natural resources.

GR 363.7 C214 1994