首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Rainforests may store much less carbon than we thought. It could be time to dramatically revise our estimates following the disc
Rainforests may store much less carbon than we thought. It could be time to dramatically revise our estimates following the disc
admin
2016-08-29
43
问题
Rainforests may store much less carbon than we thought. It could be time to dramatically revise our estimates following the discovery that apparently similar forests hold vastly different amounts of the stuff. The finding is important because there are plans for governments worldwide to compensate tropical countries for protecting their forests as "carbon sinks" to curb global warming. If carbon cannot be counted, then dollars cannot be disbursed(支付).
Greg Asner of the Carnegie Institution for Science in Stanford, California, and colleagues say they used satellite mapping, laser probing of forest undergrowth from aircraft and local ground surveys across a large area of Peruvian rainforest to crack the problem of estimating how much carbon is locked up in forests. But the new technique has revealed a large, previously unknown variability in the density of carbon stored in apparently similar forests.
The Intergovernmental Panel on Climate Change says that there should be about 587 million tonnes of carbon stored in the study area, 43,000 square kilometres of lowland forest in the Madre de Dios region of Peru. But after dividing the area into 40 million individual grid(格子)squares and estimating for each the carbon stored as well as the rate at which it is being fixed and released, Asner says the real figure is just 395 million tones, a third less. "What really surprised us was how carbon storage differed among forest types and the underlying geology," says Asner. For instance, where the underlying rocks are younger, the soils and forests contain more carbon. "There has been no way to uncover these incredible patterns till now."
The study also reveals major carbon loss due to logging, farming, mining and road construction—even in areas still covered by forest. This "forest degradation" made up almost 50 per cent of all carbon lost from the forest. But the study also found substantial carbon accumulated through natural forest regrowth on abandoned land.
Asner is now conducting similar studies elsewhere round the world, which he says can be used to police the United Nations’ proposed initiative on Reducing Emissions from Deforestation and Forest Degradation in Developing Countries. This scheme would compensate countries that protect their forests to store carbon. It’s important that countries with large rainforests do this, because around 15 per cent of global carbon dioxide emissions come from tropical deforestation.
Markku Kanninen, a forest scientist at the Center for International Forestry Research, a World Bank-backed body based in Bogor, Indonesia, agrees: "This research shows the importance of improving our data on forest carbon. The IPCC global default values are not precise enough for national inventories."
What does Greg Asner think about the problem of determining how much carbon is stored in forests?
选项
A、It has already been settled.
B、It has caused much dispute.
C、It is not as difficult as expected.
D、It is unlikely to be solved soon.
答案
A
解析
该句中的they used…to crack the problem表明Greg Asner与其同事已解决了如何估算森林存储碳量的难题。因此,本题应选A。
转载请注明原文地址:https://kaotiyun.com/show/uiG7777K
0
大学英语六级
相关试题推荐
A、Sheisgoingtoanexhibitionabroad.B、Sheisgoingtoaweddingceremony.C、SheisgoingonavoyageoverthePacific.D、She
DoctorsinBritainarewarningofanobesity(肥胖症)timebomb,whenchildrenwhoarealreadyoverweightgrowup.So,whatshould
A、Topersuadehertotaketheschoolbuswithhim.B、Toaskforherhelpinphysicsexamination.C、Tofindoutherattitudetowa
Newtechnologylinkstheworldasneverbefore.Ourplanethas【B1】______.It’snowa"globalvillage"wherecountriesareonlysec
A、Tocompeteforcustomers.B、Toreducethesizeoftheirstaff.C、Toprovideservicesfordistantclients.D、Toexpandtheirop
Forauthorsofself-helpguides,nohumanproblemistoogreatortoosmall.Wanttobecomefitter,richerorhappierin2015?T
Americansgavealmosttwohundredfiftythousandmilliondollarstocharityin2004.Itwasafivepercent【B1】______toanewrec
意大利著名旅行家马可·波罗曾这样叙述他印象中的杭州:“这是世界上最美妙迷人的城市,它使人觉得自己是在天堂。”在中国也流传着这样的话:“上有天堂,下有苏杭。”杭州的名气主要在于风景如画的西湖。杭州是中国著名的六大古都之一,已有两千多年的历史。杭州不仅以自然美
中国人的出行方式,经过了一个从“体力”到“便捷”的漫长过程。20世纪50至70年代,自行车是中国人最“拉风”的代步工具,也是那个时期最具有符号意义的社会特征。20世纪80年代,摩托车(motorcycle)开始逐步成为交通工具中的“新宠”。20世纪90年代
Writealetterofcomplaintaccordingtothefollowingsituation-.YouboughtanairconditionerinSunApplianceStoreandhad
随机试题
下列关于项目信息门户的说法,不正确的有()。
突触是神经系统信息传递过程中的重要结构,神经疾患中常出现突触结构和功能的改变。关于人体突触,下列说法中错误的是
女性,55岁,4年来逐渐出现上腹胀满,食欲减退,伴舌炎及巨幼细胞贫血,胃镜见胃黏膜红白相间以白为主,该患诊断首先考虑
2015年4月18日,王某涉嫌职务侵占被B市A区公安分局刑事拘留14日,5月1日被取保候审。2016年11月17日,王某被A区检察院批准逮捕。2017年3月28日,A区检察院向A区法院提起公诉。7月9日。A区法院判处王某有期徒刑1年6个月,宣告缓刑2年。7
【背景】某写字楼标准层电梯厅共20套,施工企业中标的“分部分项工程和单价措施项目清单与计价表”如表3.1.1所示,现根据图3.1.1—图3.1.3所示的电梯厅土建装饰竣工图及相关技术参数,按下列要求,编制电梯厅的竣工结算。【问题】按该分部
下列对专业人程分包人与发包人之间关系的表述,不正确的是()。
产品质量认证的获准认证条件是()。
在诸子学派中,曾对魏晋玄学和佛教禅宗产生深刻影响的是()。
下列关于行政诉讼中举证责任的说法,正确的是()。
Recently,theeventsofbombexplodingwereoftenhappenedintheareasoftheworld.Meanwhile,twobombsexplodedinAlgeriaT
最新回复
(
0
)