Clean freshwater resources are essential for drinking, bathing, cooking, irrigation, industry, and for plant and animal survival. Unfortunately, the global supply of freshwater is distributed unevenly. Chronic water shortages exist most of Africa and drought is common over much of the globe. The sources of most freshwater supplies - groundwater (water located below the soil surface), reservoirs, and rivers - are under severe and increasing environmental stress because of overuse, water pollution, and ecosystem degradation. Over 95 percent of urban sewage in miserable countries is discharging untreated into surface waters such as rivers and harbors;About 65 percent of the global freshwater supply is used in farming and 25 percent is used in industry. Freshwater conservation therefore requires a reduction in wasteful practices like inefficient irrigation, reforms in agriculture and. industry, and strict pollution controls worldwide.
đang được dịch, vui lòng đợi..