In face of global warming, much effort has been focused on reducing GREenhouse gas emission through a variety of strategies.(47) But while much of the research and innovation has concentrated on finding less-polluting energy alternatives, it may be decades before clean technologies like wind and solar meet a significant portion of our energy needs.
In the meantime, the amount of CO2 in the air is rapidly approaching the limits proposed by the Intergovernmental panel on Climate Change(IPCC).” As long as we’re consuming fossil fuels, we’re putting out CO2,” says Klaus Lackner, a geophysicist at Columbia University.” We cannot let the CO2 in the atmosphere rise indefinitely.”
That sense of urgency has increased interest in capturing and storing CO2,which the IPCC says could prove provide the more than 50% reduction in emissions thought needed to reduce global warming. (48)“We see the potential for capture and storage to play an integral role in reducing emissions,” says Kim Corley, Shell’s senior advisor of CO2 and environmental affairs. That forward thinking strategy is gaining support. The U.S. Department of energy recently proposed putting $1billion into a new $2.4billion coal-burning energy plant. The plant’s carbon-capture technologies would serve as a pilot project for other new coal-burning plants.
But what do you do with the gas once you’ve captured it? (49) One option id to put it to new uses. Dakota Gasification of North Dakota captures CO2 at a plant that converts coal into synthetic natural gas, It then ships the gas 200 miles by pipeline to Canada, where it is pumped underground in oil recovery operations. (50) In the Netherlands, Shell delivers CO2 to farmers whop pipe it into their GREenhouse, increasing their yield of fruits and vegetables.
(51) However, scientists say that the scale of CO2 emissions will require vast amounts of long term storage. some propose storing the CO2 in coal mines or liquid storage in the ocean ,Shell favors storing co2 in deep geological structures such as saline formations and exhausted oil and gas fields. that exist throughout the world.
47. What are suggested as renewable and less-polluting energy alternatives?
答案：Wind and solar.
解析：用renewable and less-polluting定位至首段第二句（同时也是转折后的重点信息），该句后半部分提出的wind and solar即是对“可再生和污染小的能源”的具体举例。
48. What does the author say is a forward thinking strategy concerning the reduction of CO2 emissions?
答案：Capturing and storing CO2.
解析：用forward thinking strategy定位至三段中部，定位句的that提示了具体答案在前两句的信息，前两句重复出现的capture and store CO2即是该两句所强调的一种方式。
49. One way of handling the captured CO2 as suggested by the author is to store it and ______.
答案：put it to new uses.
解析：用captured CO2定位至四段首句，在第二句中作者即回答了首句的问题，该句的option就是题干的way，to put it to new uses即是题干需要的具体行为。
50. Through using CO2, Dutch farmers have been able to ______.
答案：increase their yield of fruits and vegetables.
解析：用Dutch farmers定位至四段末句，题干be able to问的是荷兰农民行为的结果，该句前半部分是行为，后半部分就是结果。
51. Long-term storage of CO2 is no easy job because of ______.
答案：the large scale of CO2 emission.
解析：用long-term storage定位至末段首句，该句提出CO2的排放规模是导致长期存储CO2的量不得不很巨大的原因。
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