D．Australians think it fair to exchange their talent with American skilled workers

　　66．In which of the following cities are workers probably most needed?

　　D

　　Scientists have long understood the key role that oceans play in regulating the Earth’s climate．Oceans cover 70 percent of the globe and store a thousand times more heat than the atmosphere does．What’s newer is the understanding of how this key component of our climate system responds to global warming．

　　A brake on global warming—for now

　　One of the ocean’s most important climate functions is absorbing heat and carbon dioxide （CO2）, one of the gases that cause global warming．Acting as a heat sponge （海绵）, the oceans have absorbed huge amounts of heat and CO2 in the last forty years．

　　Fujita explains that “the oceans are saving us from faster climate change—they are a big flywheel that delays rapid overheating of the earth, putting a brake on the climate system．”

　　“That’s the good news,” he adds．“The bad news is that the oceans only slow the atmospheric warming．Once the oceans come to balance with a greenhouse-gas warmed earth, the extreme heat will remain in the atmosphere and things will get much hotter．” But where and how the oceans release this accumulated （积累） heat is uncertain．And as the ocean stores heat, fragile underwater ecosystems are struggling．

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