TY  - BOOK
AU  - Canby, Thomas Y.
TI  - Our changing earth
SN  - 870449109
AV  - R GE 195 .C160 1994 
PY  - 1994///
CY  - Washington, D.C.
PB  - The Society
KW  - Conservation of natural resources
KW  - sears
KW  - Environmental degradation
KW  - Environmentalism
N2  - Discusses factors which cause destruction to life on earth such as the following:deforestation,depletion of the ozone layer with its threat of harmful ultraviolet radiation; loss of reefs and wetlands,contamination of the air with emissions and the waters with pollutants and overpopulation . Discusses further the cause of the altered ecosystems namely:agriculture and industry and their hazardous effects to the earth and its populace
ER  -