During the last 50 years, humans have degraded rivers and lakes through excessive water abstraction, pollution and by over-harvesting aquatic organisms. River flow has been impeded by dams, and floodplains have been converted for agriculture and urban areas. The human population has doubled to nearly 7 billion and, per capita water availability has declined on all continents. During the past 50 years, global climate change has further impacted water resources. On Nov. 7, three climate experts will speak on "Global Environmental Change And Freshwater Resources: Hope For The Best Or Change To Prepare For The Worst?" during the annual Where…