写濒临危机动物的英语作文北极熊篇四：
The global polar bear population could decline by more than 30 percent in as little as 35 years. That's according to a new study in The Royal Society's Biology Letters.
全球北极熊数量在35年内可能下降超过百分之30。这是根据英国皇家学会生物学快报的一项新研究。
Researchers looked at climate change effect on the Arctic Sea and calculated the likelihood of this projected population drop is 71 percent.
研究人员观察气候变化对北极海的影响，并计算出预计种群下降的可能性为百分之71。
That's because polar bears stand on Arctic Sea ice when hunting for seals. According to NASA, even the thickest ice in the Arctic Ocean has "either thinned or melted away."
这是因为北极熊捕猎海豹时站在北极海的冰上。美国国家航空航天局表示，甚至北冰洋最厚的冰要么变薄或要么融化了。
And just this week, scientists reported sea ice levels in the area were at a record low for this time of year.
就在本周科学家报告称，该地区的海冰水平创下一年中这个时候的历史新低。
This all adds up to not great news for polar bears. With an estimated population of 26,000, the bears are already listed as a vulnerable species by the International Union for the Conservation of Nature.
这对北极熊不是什么好的消息。现估计有26,000头北极熊，已被国际自然保护联合会列为易危物种。