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Global warming could be reversed

2013-08-01 16:29 Web Editor: yaolan


Kēxuéjiā chēng quánqiú biànnuǎn xiànxiàng huòxǔ kě dàozhuǎn

Global warming could be reversed



Global warming could be reversed used a combination of burning trees and crops for energy, and capturing and storing carbon dioxide underground (CCS), according to an analysis by scientists. But experts cautioned that trying such an approach after temperatures had passed dangerous levels could be problematic, as climate change reduced the number of trees available for "bioenergy".


The bioenergy and CCS method was the most cost-effective way of tackling carbon emissions, said the team Chalmers University of Technology in Sweden, publishing their research in the journal Environmental Research Letters. Such an approach could offset and even reverse other emissions from fossil fuels, they claimed.


CCS technology has been tested successfully on small-scale trials, but is still unproven at commercial scale anywhere in the world. Environmentalists have also questioned the carbon benefits of burning trees for power, saying that in some cases the "lifecycle" emissions are worse than coal.


Dr. Vivian Scott of Scottish Carbon Capture Storage at the University of Edinburgh, who was involved with the research, said that the basis for the research's conclusion was sound, but she warned it should not be interpreted "as a 'get out of jail free' card in 50 years' time" and the idea could be hamstrung by climate change itself.

她说:"正如这项研究所示,生物能结合碳捕捉与封存技术可以提供技术支持,以保证温度在气候目标范围内.但是,过分强调(那些目标)有可能造成严重的后果.短时间内气候变暖可能深深地改变气象和生态系统---这种改变甚至可能 限制生物量的产生.我们也许要依赖于生物量从而减少大气中二氧化碳的含量."

"As shown in this work, Beccs [Bioenergy with Carbon Capture and Storage] could offer a way back from exceeding climate targets. However, there are potentially huge consequences to allowing an overshoot [of those targets]. A warmer climate for even a limited period could profoundly alter meteorological and ecological systems – changes which could perhaps even restrict the ability to produce the biomass on which we might be reliant to reduce the atmospheric carbon dioxide content," she said.


She also said that reducing carbon emissions to zero could be a major challenge, given the track record of previous efforts to cut carbon: "Progress in addressing emissions has been woefully slow - the International Energy Agency recently announced that the average amount of carbon dioxide produced for each unit of energy generated has barely changed in the period 1990 - 2010 … in essence all the emissions mitigation efforts to date have achieved almost nothing".


抵消 (dǐxiāo) offset

倒转 (dàozhuǎn) reverse

改变 (gǎibiàn) alter

大体上 (dàtǐshàng) in essence

(Source: myechinese.com)


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