The emergence of various ecological degradations is the best talking example. 北京与周边出现种种的生态退化问题，是最明显的例证。
He said the hydro-electric project has caused conflicts over land shortages and environmental degradation caused by irrational development. 他说，叁峡水电站工程导致了土地缺乏的冲突矛盾和不合理开发造成的生态退化。
