首页
登录
职称英语
Eight thousand years ago, forests covered more than 23 million square miles,
Eight thousand years ago, forests covered more than 23 million square miles,
游客
2023-12-23
32
管理
问题
Eight thousand years ago, forests covered more than 23 million square miles, or about 40 percent of Earth’s land surface. Today, almost half of those forests have fallen to the ax, the chain saw, the matchstick, or the bulldozer.
A map unveiled in March by the Washington-based World Resources Institute not only shows the locations of former forests, but also assesses the condition of today’s forests worldwide. Institute researchers developed the map with the help of the World Conservation Monitoring Center, the World Wildlife Fund, and 90 forest experts from a variety of universities, government organizations, and environmental groups.
Only one-fifth of the remaining forests are still "frontier forests", defined as a relatively undisturbed natural forests large enough to support all of their native species. Frontier forests offer a number of benefits: They generate and maintain biodiversity, protect watersheds, prevent flooding and soil erosion, and stabilize climate.
Many large areas that have traditionally been classified as forest land don’t qualify as "frontier" because of human influences such as fire suppression and a patchwork of logging. "There’s surprisingly little intact forest left," says research associate Dirk Bryant, the principal author of the report that accompanies the new map.
In the report, Bryant, Daniel Nielsen, and Laura Tangley divide the world into four groups: 76 countries that have lost all of their frontier forest; 11 nations that are "on the edge"; 28 countries with "not much time"; and only eight—including Canada, Russia, and Brazil—that still have a "great opportunity" to keep most of their original forest. The United States is among the nations said to be mining out of time: In the lower 48 states, says Bryant, "only 1 percent of the forest that was once there as frontier forest qualifies today."
Logging poses the biggest single threat to remaining frontier forests. "Our results suggest that 70 percent of frontier forests under threat are threatened by logging," says Bryant. The practice of cutting timber also creates roads that cause erosion and open the forest to hunting, mining, firewood gathering, and land clearing for farms.
What can protect frontier forests? The researchers recommend combining preservation with sustainable land use practices such as tourism and selective timber extraction. It’s possible to restore frontiers," says Bryant, "but the cost and time required to do so would suggest that the smart approach is to husband the remaining frontier forest before it’s gone. [br] Which of the following is the best way to restore frontier forests according to Bryant?
选项
A、To make people self-conscious of the environment.
B、To curb tourism.
C、To protect them now.
D、To use them for farmlands.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3299033.html
相关试题推荐
Whatdoesitmeantorelax?Despite【C1】______thousandsoftimesduringtheco
Whatdoesitmeantorelax?Despite【C1】______thousandsoftimesduringtheco
Whatdoesitmeantorelax?Despite【C1】______thousandsoftimesduringtheco
Whatdoesitmeantorelax?Despite【C1】______thousandsoftimesduringtheco
Whatdoesitmeantorelax?Despite【C1】______thousandsoftimesduringtheco
Whatdoesitmeantorelax?Despite【C1】______thousandsoftimesduringtheco
Whatdoesitmeantorelax?Despite【C1】______thousandsoftimesduringtheco
Whatdoesitmeantorelax?Despite【C1】______thousandsoftimesduringtheco
Whatdoesitmeantorelax?Despite【C1】______thousandsoftimesduringtheco
Whatdoesitmeantorelax?Despite【C1】______thousandsoftimesduringtheco
随机试题
ReadtheadvertisementsbelowandanswerQuestions8-14.ASTEADMAN&COCHARTE
Menandwomen______equalwagesforequaljobsinChina.A、arepaidB、paidC、being
【B1】[br]【B3】A、problemB、difficultyC、troubleD、matterD本题考查词汇辨析能力。problem指“需要解
[originaltext]M:Goodmorning,Madam.CanIhelpyou?W:I’dliketobuyahand
TCP/IP网络中最早使用的动态路由协议是RIP协议,这种协议基于(本题)算法
利用单波束回声测深仪进行水深测量时,对主测深线与等深线应保持的方向要求包括()A
我国最早开始实行班级授课制的学校是1862年建立的()。A.福建船政学堂 B.
期货公司的下列人员中,任职资格自离任之日起失效的是()。A.副总经理 B.
特种设备安全法确定的起重机械类特种设备,是指用于垂直升降或者()重物的机电
在病例对照研究中,若暴露存在因素的暴露史的比例显著高于对照组,且有统计学意义,则
最新回复
(
0
)