00838nam a2200205Ia 4500 CTU_109704 210402s9999 xx 000 0 und d 333.952816 P857 Postel, Sandra Liquid assets : The critical need to safeguard freshwater ecosystems Sandra Postel, Lisa Mastny Washington, D.C. Worldwatch Institute 2005 Rivers, lakes, wetlands, and other freshwater ecosystems provide a host of benefits to society. In addition to supplying water and fish, they store seasonal floodwaters, helping to lessen flood damages. Freshwater ecology,Watershed management,Ecosystem management,Water-supply Minh, Q. Hieu Trung tâm Học liệu Trường Đại học Cần Thơ