★英語聽力頻道為大家整理的八上英語聽力材料：全球變暖對灰熊有益處么，供大家參考。更多閱讀請查看本站英語聽力頻道。
Is Global Warming Good For Grizzlies?
You’ve probably heard that climate change is bad news for many animal species like polar bears. Warmer temperatures mean less sea ice in the Arctic region. And with less ice, there’s less room there is for polar bears to hunt. And so their populations shrink.
But rising temperatures do not affect all animals in equally harmful ways. For some animals, even for some bears, warming may be beneficial. Take, for example, the grizzly.
Like pretty much all animals, grizzly bears thrive when they have more food. A ten year study that followed 112 bears in the Rocky Mountains of Alberta, Canada, has found that warmer temperatures have resulted in grizzlies having easier access to food.
The more food they have, the fatter the bears get. And the more fat lady grizzlies store, the better their chances of having healthy cubs. Cubs born during warmer than normal years were found to grow into larger and healthier adults.
Of course, this in no way negates the fact that climate change is a serious issue requiring immediate and ongoing attention. For every species that may benefit from global warming, many more may suffer and possibly go extinct.
But the study does show that warming does not necessarily spell total gloom and doom for all animal species. Plus, the research may give scientists a clue about how to alter forest harvest designs to increase the grizzly population in the Canadian Rockies. At the moment, there are only around 750 bears in Alberta, making them an endangered species.
全球變暖對灰熊有益嗎？
你可能聽說過，氣候變化對很多諸如北極熊這樣的物種都是不利的。溫度越高，北極區(qū)域的海上浮冰就會越少，進而就會使得北極熊的狩獵范圍縮小。最后就會導致北極熊的物種數(shù)量萎縮。
但溫度升高并不會對所有動物產(chǎn)生同樣的不利影響。對有些動物，甚至是一些熊類來說，全球變暖是有利的。就拿灰熊來舉個例子吧。
灰熊幾乎跟所有動物一樣，只要有足夠的食物，他們就可以繁衍生息。在一項為期十年的研究中，研究人員對加拿大亞伯達省落基山脈的112只熊進行了觀察，發(fā)現(xiàn)溫度越高，灰熊就越容易找到食物。
食物越多，灰熊就能夠儲存更多的脂肪。然而雌熊儲存的脂肪越多，他們繁殖健康幼崽的幾率也就越大。在溫度較高的時候出生的熊仔一般要比正常溫度下的熊仔長的更大，更加健康。
當然，不可否認的是，氣候變化仍然是一個嚴重且需要我們密切關注的問題。對于每一個能從全球變暖獲益的物種來說，這里仍然存在著更多物種可能會面臨著滅絕的危險。但是研究確實表明，全球變暖對所有物種來說并不都是噩耗。
此外，科學家們從這項研究中還知道了如何通過改變森林收獲量來增加加拿大落基山脈的灰熊數(shù)量。目前，亞伯達地區(qū)只有大概750只灰熊，它們已經(jīng)被列入了瀕危物種的名單之中。
Is Global Warming Good For Grizzlies?
You’ve probably heard that climate change is bad news for many animal species like polar bears. Warmer temperatures mean less sea ice in the Arctic region. And with less ice, there’s less room there is for polar bears to hunt. And so their populations shrink.
But rising temperatures do not affect all animals in equally harmful ways. For some animals, even for some bears, warming may be beneficial. Take, for example, the grizzly.
Like pretty much all animals, grizzly bears thrive when they have more food. A ten year study that followed 112 bears in the Rocky Mountains of Alberta, Canada, has found that warmer temperatures have resulted in grizzlies having easier access to food.
The more food they have, the fatter the bears get. And the more fat lady grizzlies store, the better their chances of having healthy cubs. Cubs born during warmer than normal years were found to grow into larger and healthier adults.
Of course, this in no way negates the fact that climate change is a serious issue requiring immediate and ongoing attention. For every species that may benefit from global warming, many more may suffer and possibly go extinct.
But the study does show that warming does not necessarily spell total gloom and doom for all animal species. Plus, the research may give scientists a clue about how to alter forest harvest designs to increase the grizzly population in the Canadian Rockies. At the moment, there are only around 750 bears in Alberta, making them an endangered species.
全球變暖對灰熊有益嗎？
你可能聽說過，氣候變化對很多諸如北極熊這樣的物種都是不利的。溫度越高，北極區(qū)域的海上浮冰就會越少，進而就會使得北極熊的狩獵范圍縮小。最后就會導致北極熊的物種數(shù)量萎縮。
但溫度升高并不會對所有動物產(chǎn)生同樣的不利影響。對有些動物，甚至是一些熊類來說，全球變暖是有利的。就拿灰熊來舉個例子吧。
灰熊幾乎跟所有動物一樣，只要有足夠的食物，他們就可以繁衍生息。在一項為期十年的研究中，研究人員對加拿大亞伯達省落基山脈的112只熊進行了觀察，發(fā)現(xiàn)溫度越高，灰熊就越容易找到食物。
食物越多，灰熊就能夠儲存更多的脂肪。然而雌熊儲存的脂肪越多，他們繁殖健康幼崽的幾率也就越大。在溫度較高的時候出生的熊仔一般要比正常溫度下的熊仔長的更大，更加健康。
當然，不可否認的是，氣候變化仍然是一個嚴重且需要我們密切關注的問題。對于每一個能從全球變暖獲益的物種來說，這里仍然存在著更多物種可能會面臨著滅絕的危險。但是研究確實表明，全球變暖對所有物種來說并不都是噩耗。
此外，科學家們從這項研究中還知道了如何通過改變森林收獲量來增加加拿大落基山脈的灰熊數(shù)量。目前，亞伯達地區(qū)只有大概750只灰熊，它們已經(jīng)被列入了瀕危物種的名單之中。