PBS高端访谈:帝王蝶可能会成为濒临灭绝的物种

HARI SREENIVASAN: Every year, millions of North American monarch butterflies head south for the winter in one of the insect world's most fantastic feats. But as you've likely heard, their numbers have declined dramatically in the past two decades. No

PBS高端访谈:濒临灭绝的虎鲸将会被放归自然?

HARI SREENIVASAN: You may have seen the documentary Blackfish that examined the treatment of killer whales at SeaWorld Orlando. Now at the Miami Seaquarium, another controversy is brewing over a whale named Lolita. The National Oceanic and Atmospheri

PBS高端访谈:饮用水管道是如何同时进行发电的?

JUDY WOODRUFF: Next: the possibilities of getting more energy through water. Humans have long harnessed the power of water to perform work. In modern time, hydroelectricity, generated by the power of water flowing through turbines at the base of dams

PBS高端访谈:为什么美国要向加拿大和澳大利亚寻求消防帮助?

WILLIAM BRANGHAM: For more on how fire officials are coping with these many fires, we turn to Ron Dunton. He's with the Bureau of Land Management. And he is helping coordinate fire response at the National Interagency Fire Center in Boise, Idaho. Ron

PBS高端访谈:揭秘矮行星--谷神星的秘密

JUDY WOODRUFF: Let's look at a space mission that's generating lots of interest and excitement. It's the mission to orbit the dwarf planet Ceres by the NASA spacecraft named Dawn. It arrived in March, and as the spacecraft has gotten closer in recent

PBS高端访谈:通过食物链引起的连锁反应将会威胁到海洋生态

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

PBS高端访谈:北极近海钻探是否破坏了奥巴马对气候保护的努力?

For more on the president's trip and some of the issues following him to the Arctic, we turn to Robert Bryce. He's a senior fellow at the Manhattan Institute, and he has written widely on oil and gas and other energy industries. And Michael Brune, ex

PBS高端访谈:气候变化正在减少雄性海龟的数量

GWEN IFILL: Now we turn to another angle of our continuing of climate change and its impact. Tonight, our science team looks at the toll it is taking on sea turtles and some of their tiniest offspring. We went to the coast of Southern Florida and cam

PBS高端访谈:今年的巴黎气候大会与往年有何不同呢?

GWEN IFILL: The climate talks over the next two weeks are expected to become a turning point in the global debate over addressing the causes of a rapidly warming planet. The lofty speeches have already begun, but what do leaders gathering in Paris th

PBS高端访谈:里程碑式的气候变化协议对美国意味着什么?

GWEN IFILL: The climate talks over the next two weeks are expected to become a turning point in the global debate over addressing the causes of a rapidly warming planet. HARI SREENIVASAN: Joining me now for further analysis of the climate change summ

PBS高端访谈:巴黎气候新协议对我们未来的影响

JUDY WOODRUFF: So, how meaningful are this weekend's pledges? And does it signal a fundamental change in how we will get our energy? Fred Krupp is the president of the Environmental Defense Fund. He's back from Paris. And Robert Bryce is a senior fel

PBS高端访谈:联合国安理会召开有关叙利亚局势的部长级会议

JUDY WOODRUFF: As we just reported, late this afternoon, the 15 nations on the United Nations Security Council voted unanimously to endorse a framework for a peace process in Syria, after nearly five years of brutal civil war that's left more than 25

PBS高端访谈:南极臭氧层空洞有所缩小

HARI SREENIVASAN, PBS NEWSHOUR WEEKEND ANCHOR: Scientists studying climate change in Antarctica reported this week that the hole in the protected ozone layer of the earth's atmosphere has shrunk. The discovery of the hole in the mid-1980s led to a wo

PBS高端访谈:科学家发现宜居新行星 离地球4光年

HARI SREENIVASAN: Time now for our weekly segment on science called the Leading Edge, and the discovery of another possible Earth-like planet that's grabbing worldwide attention today. It is true, scientists have previously said they believe there ar

PBS高端访谈:海平面上升对未来几代人意味着什么?

GWEN IFILL: But, first, a trio of new studies provide new alarm about rising sea levels, and the prospect of further flooding along the coasts. Among them, seas rose faster during the past century than at any point in the last 2,800 years. Hari Sreen

PBS高端访谈:美国国家公园迎100岁生日

HARI SREENIVASAN: It was a hundred years ago today that President Woodrow Wilson signed what was called the Organic Act, creating the National Park Service. Jeffrey Brown takes our Bookshelf outdoors. JEFFREY BROWN: Terry Tempest Williams, author, na

pbs高端访谈:暮光狼人海滩如何应对海平面上升

HARI SREENIVASAN:Tourists may come here to see the imaginary werewolves, but what they find is the real story of a people who have endured. On the beaches of La Push, Wash., Ann Penn Charlesor Ms. Ann, as she's knownis passing on the tradition of fis

pbs高端访谈:英国石油公司将支付美国历史上最高罚金

JEFFREY BROWN:And we turn to a major development in a story that grabbed the nation's attention for months in 2010, as oil giant BP reached a settlement today in one part of its ongoing dispute with the federal government over the GulfCoast spill. It

pbs高端访谈:因不能满足基本需求 受灾群众开始失去耐心

JUDY WOODRUFF:This was another difficult day in the aftermath of Hurricane Sandy. The U.S. death toll rose to at least 102, and for millions of people, basic needs became increasingly urgent. Ray Suarez has the story. RAY SUAREZ:Four days after Sandy

pbs高端访谈:大峡谷的历史还要往前追溯六千万年?

MARGARET WARNER:Finally tonight: Just how old is the Grand Canyon? The conventional wisdom holds that this natural wonder of the world was shaped by the Colorado River about five or six million years ago. But there's been a long-running debate over w