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.

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