GWEN IFILL: While global leaders meet to discuss action on climate change, one new threat has emerged in the world's oceans. As Scott Shafer from our San Francisco station KQED reports, the threat may not be visible to the naked eye, but it changes t

发表于:2019-01-27 / 阅读(82) / 评论(0) 分类 PBS访谈环境系列

When we lose reefs, we lose basically the cradles of evolution in the oceans. Wolfgang Kiessling A new study out this week highlights the role that coral reefs play in evolution, adding another reason to preserve these delicate, diverse, and often be

发表于:2019-02-02 / 阅读(94) / 评论(0) 分类 VOA标准英语2010年(一月)