首页
登录
职称英语
Scientists have long believed one way to stop the Earth’s atmosphere from wa
Scientists have long believed one way to stop the Earth’s atmosphere from wa
游客
2023-09-16
69
管理
问题
Scientists have long believed one way to stop the Earth’s atmosphere from warming is by planting more trees. The idea is that more trees will take in or absorb some of the carbon dioxide in the atmosphere. Carbon dioxide is a gas released by cars, factories and other human activities. The gas traps heat in the Earth’s atmosphere, which warms the planet. However, two new studies have found that trees may not be as helpful in reducing carbon dioxide as had been thought.
The first study was done at Duke University in Durham, North Carolina. Researchers pumped extra carbon dioxide into a test area where pine trees were growing. The trees grew thirty-four percent faster during the first three years. However, in time, the trees slowed to about their normal growth rate. The scientists say this is because trees need other nutrients, such as nitrogen.
In the second study, researchers from Duke and Bowdoin College in Brunswick, Maine examined the soil around trees. They discovered that as the leaves broke down into the soil, all the carbon was not trapped in the soil. Much of it was released into the atmosphere as carbon dioxide.
The findings of the two studies were published last month in Nature magazine. They suggest there is limited value in planting trees to reduce the carbon dioxide pollution in the atmosphere.
Forest planting has been a part of negotiations on a world agreement to reduce greenhouse gases that scientists believe cause global warming. The United States, Canada, Japan and some other industrial countries have supported the idea. But this new research suggests the idea is not as effective as environmental activists had thought. Scientist Ram Oren of Duke University led the study on tree growth. He says that earlier estimates on the ability of forests to absorb carbon dioxide were overly hopeful.
Some scientists not involved in the studies say the research provides some of the first evidence on how trees react to carbon dioxide. Other scientists say the research disputes a belief among some coal and power companies. The companies say that rising levels of carbon dioxide in the atmosphere will not create harmful global warming. Instead, they say it will increase forests and other plants.
选项
A、Introduce some new ideas about the relationship between trees and carbon dioxide.
B、Introduce recent condition of global industrial pollution.
C、Call on people to plant more trees to reduce greenhouse gases.
D、Point out that power companies should be responsible for the rising levels of carbon dioxide.
答案
A
解析
主题题。B,D均与本文无关;C则由于实验显示树木吸收并不那么有效,因此从本文观点来看正好错误。
转载请注明原文地址:https://tihaiku.com/zcyy/3019408.html
相关试题推荐
Scientistsfindthathard-workingpeoplelivemuchlongerthanaveragemena
Scientistsfindthathard-workingpeoplelivemuchlongerthanaveragemena
Scientistsfindthathard-workingpeoplelivemuchlongerthanaveragemena
Scientistsfindthathard-workingpeoplelivemuchlongerthanaveragemena
Scientistsfindthathard-workingpeoplelivemuchlongerthanaveragemena
Scientistsfindthathard-workingpeoplelivemuchlongerthanaveragemena
Picasso’sartwasnotjustapleasantdistraction.Theartistbelievedthat
Globalwarmingreferstotheaveragetemperatureoftheatmosphere,oceans,and
Globalwarmingreferstotheaveragetemperatureoftheatmosphere,oceans,and
Globalwarmingreferstotheaveragetemperatureoftheatmosphere,oceans,and
随机试题
【题目来源】1月7日下午四川省成都市结构化面试考题 【考题回顾】某老师家
Openthewindow,__?A.doyou B.don'tyou
A.气胸 B.心包填塞 C.血胸 D.空气栓塞 E.血肿中心静脉穿刺后胸
审计人员发现被审计单位某银行账户的银行对账单余额与银行存款日记账余额不符时,应采
下列有关水泥标准稠度用水量的说法错误的是()。A.测定水泥标准稠度用水量的方法有
胃痛的病机是A.胃失和降,逆气动膈 B.胃失和降,胃气上逆 C.胃气阻
DIC时,血液凝固性表现为A.凝固性增高B.凝固性降低C.凝固性先增高后降低D.
治疗心肾不交所致不寐,应首选的方剂是A.六君子汤合二阴煎 B.养心汤合越鞠丸
肝性脑病的常见诱因有()A.上消化道出血 B.低血钾 C.感染 D.高
女性,37岁,3周来腹胀、乏力、盗汗,腹部膨隆,查体移动性浊音(+),血沉40m
最新回复
(
0
)