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In Bykovsky, a village of 457 on Russia&39;s northeast coast, the shoreline is collapsing, creeping closer and closer to houses and tanks of heating oil, at a rate of 15 to 18 feet a year.
"It is practically all ice - permafrost - and it is thawing." For the four million people who live north of the Arctic Circle, a changing climate presents new opportunities. But it also threatens their environment, their homes and, for those whose traditions rely on the ice-bound wilderness, the preservation of their culture.
A push to develop the North, quickened by the melting of the Arctic seas, carries its own rewards and dangers for people in the region. The discovery of vast petroleum fields in the Barents and Kara Seas has raised fears of catastrophic accidents as ships loaded with oil and, soon, liquefied gas churn through the fisheries off Scandinavia, headed to markets in Europe and North America. Land that was untouched could be tainted by pollution as generators, smokestacks and large vehicles sprout to support the growing energy industry.
Coastal erosion is a problem in Alaska as well, forcing the United States to prepare to relocate several Inuit villages at a projected cost of $100 million or more for each one.
Across the Arctic, indigenous tribes with traditions shaped by centuries of living in extremes of cold and ice are noticing changes in weather and wildlife. They are trying to adapt, but it can be confounding.
In Finnmark, Norway&39;s northernmost province, the Arctic landscape unfolds in late winter as an endless snowy plateau, silent but for the cries of the reindeer and the occasional whine of a snowmobile herding them.
A changing Arctic is felt there, too. "The reindeer are becoming unhappy," said Issat Eira, a 31-year-old reindeer herder.
Few countries rival Norway when it comes to protecting the environment and preserving indigenous customs. The state has lavished its oil wealth on the region, and Sami culture has enjoyed something of a renaissance.
And yet no amount of government support can convince Mr. Eira that his livelihood, intractably entwined with the reindeer, is not about to change. Like a Texas cattleman, he keeps the size of his herd secret. But he said warmer temperatures in fall and spring were melting the top layers of snow, which then refreeze as ice, making it harder for his reindeer to dig through to the lichen they eat.
"The people who are making the decisions, they are living in the south and they are living in towns," said Mr. Eira, sitting inside his home made of reindeer hides. "They don&39;t mark the change of weather. It is only people who live in nature and get resources from nature who mark it."
A push to develop the North, quickened by the melting of the Arctic seas, carries its own rewards and dangers for people in the region. The discovery of vast petroleum fields in the Barents and Kara Seas has raised fears of catastrophic accidents as ships loaded with oil and, soon, liquefied gas churn through the fisheries off Scandinavia, headed to markets in Europe and North America. Land that was untouched could be tainted by pollution as generators, smokestacks and large vehicles sprout to support the growing energy industry.

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简述作物病虫害化学防治的优点、缺点和存在问题。

Faced with growing evidence that avian influenza is spreading in birds, the World Health Organization on Wednesday signed an agreement with the Swiss pharmaceutical company Roche Holding to build up its stockpile of medicines in case of a pandemic in humans.
Under the agreement, Roche will reserve three million treatments of its Tamiflu antiviral medicine for use by the UN agency in case of a worldwide human pandemic of avian flu.
"It&39;s just enough to deal with an initial outbreak," said Jong-Wook Lee, director-general of the WHO. "But clearly this is not enough to deal with a full pandemic."
The agency says only 57 people in Indonesia, Vietnam, Thailand and Cambodia have died, mainly from contact with infected birds. The virus has killed millions of chickens and led to preventive culling across Asia since late 2003. Sustained human-to-human infection has not yet been recorded. But the World Health Organization warns that bird flu, which first appeared in Hong Kong in 1997, could mutate genetically, making it easier for humans to catch and transmit the disease among themselves.
Signs the disease has spread recently to birds in Siberia and Kazakhstan are adding to concerns, the WHO says. A panel of European Union experts will convene Thursday in Brussels to discuss measures to prevent the spread of bird deaths to European poultry.
When asked whether he thought a widespread outbreak in humans was imminent, Lee said: "We don&39;t know when it will come. But it would be hugely irresponsible if the WHO and member states did not take preventive measures now."
Roche declined to give figures for its stockpiles of Tamiflu.
A spokeswoman for the company, Martina Rupp, said it took from 12 to 18 months to deliver the drug after an order was placed- a relatively long time due to a complicated production process.

试述有机肥的优缺点。

根据水稻对温、光条件的反应,水稻是()

A. 高温、长日作物
B. 高温、短日作物
C. 低温、长日作物
D. 低温、短日作物

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