Our changing Earth /
Canby, Thomas.
Our changing Earth / by Thomas Y. Canby ; prepared by the Book Division, National Geographic Society. - Washington, D.C. : The Society, 1994 - 199 pages : color illustrations ; 25 cm.
Includes index.
9780870449109
Conservation of natural resources.
Environmental degradation --
Environmentalism.
Nature -- --Citizen participation.--Effect of human beings on.
550 / C214ou 1994
Our changing Earth / by Thomas Y. Canby ; prepared by the Book Division, National Geographic Society. - Washington, D.C. : The Society, 1994 - 199 pages : color illustrations ; 25 cm.
Includes index.
9780870449109
Conservation of natural resources.
Environmental degradation --
Environmentalism.
Nature -- --Citizen participation.--Effect of human beings on.
550 / C214ou 1994