标签：ecological 相关文章
Climate change may be partly to blame for the massive die-off of pine trees in the western U.S. But it works the other way, too: forest die-offs can alter the global climate. I like thinking of this as a parallel to something like El Nino. Abigail Sw
2016年Scientific American(十一)月
嘉宾：Debbie Mason 话题：野生象保护学者Dame Daphne及其纪录片《Born to be wild 3D》 单词拼写： 1、Warthogs：a sort of wild pig in Africa 2、Tsavo：Tsavo National Park 3、Empathy：understand the same situation 4、Captivi
聆听悦耳英音
Public Hearings on Popular Pesticide Spotlight Safety Concerns Every year, U.S. farmers apply more than 35 million kilograms of the pesticide atrazine on their fields of corn, sugarcane, sorghum and other crops. But a growing body of scientific evide
VOA标准英语2012年(六月)
senior United Nations' official in Asia says the financial crisis hitting regional economies is an opportunity to boost investment in green technologies to impact climate change. The comments by U.N. Undersecretary General Noeleen Heyzer, head of th
VOA标准英语2009年(二月)
The United Nations is calling for billions of dollars to be spent by governments to fight climate change and greenhouse gasses to stem rising global temperatures. 联合国呼吁各国政府投资数十亿美元来对抗气候变化和温室气体等问
VOA双语新闻 2009年9月
A leading U.S. advocate for combating climate change has unveiled an ambitious plan to drastically slash global carbon emissions over the next 12 years, saying aggressive action is both necessary and feasible. VOA's Michael Bowman reports from Washi
VOA标准英语2008年（七月）
Every spring, the Mississippi River dumps tens of thousands of tons of nutrient runoff into the Gulf of Mexico. Add temperature, current and wind to that pollution, and you have the Western Hemisphere's largest stretch of oxygen-poor watersa so-calle
2017年Scientific American(二)月