000			00803nam a2200277Ia 4500
008			170203s9999 xx 000 0 und d
020			_a9780870449109
050			_a550
050			_bC214ou 1994
100			_aCanby, Thomas.
245			_aOur changing Earth /
245			_cby Thomas Y. Canby ; prepared by the Book Division, National Geographic Society.
260			_aWashington, D.C. :
260			_bThe Society,
260			_c1994
300			_a199 pages :
300			_bcolor illustrations ;
300			_c25 cm.
500			_a Includes index.
650			_aConservation of natural resources.
650			_aEnvironmental degradation --
650			_aEnvironmentalism.
650			_aNature --
650			_xCitizen participation.
650			_xEffect of human beings on.
999			_c305720 _d305720