Humpback whales(座头鲸) have benefited greatly from recent conservation efforts as well. They were once on the International Union for Conservation of Nature's (IUCN)list of species threatened with extinction. But the species is now in less danger, thanks to laws that ban whale hunting. The IUCN even moved the humpback into “species of least concern.”
Over the past 100 years, the white rhino(犀牛) of South Africa has also made an amazing recovery because of habitat protection. The breed multiplied from just 50 animals to about 17,000. Their home has been turned into a protected area, safe from poachers and other threats.
Stuart Butchart, one of the authors of the new study in Science, is encouraged by the positive effects of conservation. But he says “Biodiversity (生物多样性)of species is in a desperate state. Its situation is getting worse. But our results show we can turn the situation around.”
New conservation policies hopefully are on the way. One hundred ninetythree countries recently met in Japan at the Convention on Biological Diversity to set concrete goals for preserving threatened wildlife and their habitats. Only 1 percent of oceans and 12 percent of land areas were protected under prior agreements. Two new goals set by the group are to designate(指定) 10 percent of the world's oceans and 17 percent of land environments as protected areas to help increase endangeredanimal populations.
【2017届高考英语(重庆专用)二轮精练:选修7 unit3 Under the sea单元测试】相关文章:
★ 【人教版】2014届高考英语一轮复习指导考点针对练:必修2 unit4《Wildlife protection》
★ 【北京专用】2014届高考英语一轮复习方案课时作业:选修8 Unit 4 Pygmalion
★ 【北京专用】2014届高考英语一轮复习方案课时作业:必修5 Unit 4 Making the news
★ 【三维设计】2017届高考英语(江苏专用)二轮复习素材:高考写作6类背诵宝典 1.书面表达常用词汇
★ 【人教版】2014届高考英语一轮复习指导考点针对练:选修8 unit1《A land of diversity》
★ 【三维设计】2017届高考英语(江苏专用)二轮复习素材:高考单词2.背佳句记单词
★ 【三维设计】2017版(江苏专用)二轮复习练习:必修2 Unit 1《Tales of the unexplained》课时跟踪检测A卷(含解析)
★ 【三维设计】2017届高考英语(江苏专用)二轮复习高考单词5大记忆法课件:3.谐音记忆法
★ 【三维设计】2017届高考英语(江苏专用)二轮复习完形填空解题技法示范课件:2
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21