00000nam##2200000za#4500 9.647682 CaOODSP 20241203113635 ta 150407|2000||||xxc||||| f|0| 0 eng|d 0-662-28754-1 CaOODSP eng n-cn--- En37-90/2000E Canada. Environment Canada. A primer on fresh water : questions and answers 5th edition. Ottawa - Ontario : Environment Canada 2000. 80p. : figs. ; 28 cm. "Learning is the key to environmental action. In addition to awareness and concern, effective environmental action requires knowledge. This publication will help Canadians learn more about an important environmental issue - fresh water. It is intended for use by individuals, educators, communities, and organizations who want to improve their understanding of the environment."--Introduction. Softcover 00-19 2000-05-12 Water quality gcpds Water conservation gcpds Water supply gcpds Marine ecosystems gcpds Notations élémentaires sur l'eau douce : (CaOODSP)9.681078 A primer on fresh water : (CaOODSP)9.874104