全球变暖或许可以倒转
文章来源:未知 文章作者:enread 发布时间:2013-07-28 08:05 字体: [ ]  进入论坛
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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. 

根据科学家的一份分析报告,通过混合燃烧树木和农作物获得的能量和利用碳捕捉与封存技术(CCS)也许可以倒转全球变暖。
 
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 emissions1, said the team Chalmers University of Technology in Sweden, publishing their research in the journal Environmental Research Letters on Thursday. Such an approach could offset2 and even reverse other emissions from fossil fuels, they claimed.
 
The lead author of the study, Prof Christian3 Azar, said it could help bring temperatures down even if they rose above the 2C level that world leaders have agreed to avoid: "Even if current political gridlock causes global warming in excess of 2C, we can reverse the temperature trend and reach targets later. This means that 2C targets, or even more ambitious targets, can remain on the table in international climate negotiations4."
 
He said that to achieve a reversal of temperatures, the combination of bioenergy and CCS would need to be combined with a huge expansion in renewable energy or nuclear power, in order to reduce emissions almost to zero. He also admitted that there was a political risk that the proposal's ability to reverse rises at a late stage could be used as an excuse for short-term inaction on emissions.
 
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 not involved with the research, said that the basis for the research's conclusion was sound, but he 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.
 
"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 ecological5 systems – changes which could perhaps even restrict the ability to produce the biomass on which we might be reliant to reduce the atmospheric6 carbon dioxide content," he said.
 
He 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".


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1 emissions 1a87f8769eb755734e056efecb5e2da9     
排放物( emission的名词复数 ); 散发物(尤指气体)
参考例句:
  • Most scientists accept that climate change is linked to carbon emissions. 大多数科学家都相信气候变化与排放的含碳气体有关。
  • Dangerous emissions radiate from plutonium. 危险的辐射物从钚放散出来。
2 offset mIZx8     
n.分支,补偿;v.抵消,补偿
参考例句:
  • Their wage increases would be offset by higher prices.他们增加的工资会被物价上涨所抵消。
  • He put up his prices to offset the increased cost of materials.他提高了售价以补偿材料成本的增加。
3 Christian KVByl     
adj.基督教徒的;n.基督教徒
参考例句:
  • They always addressed each other by their Christian name.他们总是以教名互相称呼。
  • His mother is a sincere Christian.他母亲是个虔诚的基督教徒。
4 negotiations af4b5f3e98e178dd3c4bac64b625ecd0     
协商( negotiation的名词复数 ); 谈判; 完成(难事); 通过
参考例句:
  • negotiations for a durable peace 为持久和平而进行的谈判
  • Negotiations have failed to establish any middle ground. 谈判未能达成任何妥协。
5 ecological IrRxX     
adj.生态的,生态学的
参考例句:
  • The region has been declared an ecological disaster zone.这个地区已经宣布为生态灾难区。
  • Each animal has its ecological niche.每种动物都有自己的生态位.
6 atmospheric 6eayR     
adj.大气的,空气的;大气层的;大气所引起的
参考例句:
  • Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
  • Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。
TAG标签: energy global carbon
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