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With global warming and melting ice, it isn¡¯t easy being a polar bear anymore. Some studies have predicted that polar bears could die out by the end of the century. The good news is not all researchers think the bears are absolutely disappearing. Scientists at the American Museum of Natural History(AMNH) have published a new paper indicating that things might not be as bad for polar bears as some scientists expect.
To understand the reason for the researchers¡¯ cautious optimism, we must first understand the factors that are threatening the polar bear¡¯s existence. Polar bears consume a diet of mainly young seals. In order to hunt these seals, polar bears need to rest at the top of sea ice---the same ice that is increasingly melting for most of the year thanks to climate change. In another 50 years, experts expect that the Arctic will be too warm for sea ice to form for half of the year, leaving polar bears without a reliable food source and in serious danger of starvation.
As it turns out, alternative food sources for the polar bears aren¡¯t completely out of the question. For as long as biologists have tailed after the animals, they¡¯ve seen polar bears eating animals found on land like caribou(ѱ¹) and snow geese---as well as the snow geese¡¯s eggs.
Can polar bears actually survive off these alternative food sources for long periods of time? To figure this out, researchers calculated the nutrients that a caribou and snow geese diet would provide. They found that even adult male polar bears would be able to obtain more calories than they would burn in hunting these meals. Moreover, the food would provide the food necessary to avoid starvation during the summer months.
Unfortunately, not all polar bears have tended to seek food on land. That said, the researchers expect that necessity would push more polar bears to hunt on land to avoid starvation. They also expect that the bears could learn from their fellow bears how to hunt on land until the practice becomes second nature.
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Bad news sells.If it bleeds£¬it leads.No news is good news£¬and good news is no news.Those are the classic rules for the evening broadcasts and the morning papers.But now that information is being spread and monitored (¼à¿Ø) in different ways£¬researchers are discovering new rules.By tracking people¡¯s emails and online posts£¬scientists have found that good news can spread faster and farther than disasters and sob stories.
¡°The ¡®if it bleeds¡¯ rule works for mass media£¬¡± says Jonah Berger£¬a scholar at the University of Pennsylvania.¡°They want your eyeballs and don¡¯t care how you¡¯re feeling.But when you share a story with your friends£¬you care a lot more how they react.You don¡¯t want them to think of you as a Debbie Downer.¡±
Researchers analyzing wordofmouth communication¡ªemails£¬Web posts and reviews£¬facetoface conversations¡ªfound that it tended to be more positive than negative(Ïû¼«µÄ)£¬but that didn¡¯t necessarily mean people preferred positive news.Was positive news shared more often simply because people experienced more good things than bad things? To test for that possibility£¬Dr.Berger looked at how people spread a particular set of news stories: thousands of articles on The New York Times¡¯ website.He and a Penn.colleague analyzed the ¡°most emailed¡± list for six months.One of his first findings was that articles in the science section were much more likely to make the list than nonscience articles.He found that science amazed The Times¡¯ readers and made them want to share this positive feeling with others.
Readers also tended to share articles that were exciting or funny£¬or that inspired negative feelings
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