学科发展一面对的挑战 Challenges and Opportunities in the Hydrologic Sciences (National Research Council,2012) The Water Cycle:An Agent of Change O Water and Life Clean Water for People and Ecosystems Challenges and Opportunities in the Hydrologic Sciences (National Research Council, 2012) ⚫ The Water Cycle: An Agent of Change ⚫ Water and Life ⚫ Clean Water for People and Ecosystems 学科发展—面对的挑战