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
2025-01-15
9
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] It can be inferred from the passage that the world is divided into four groups in order to ______.
选项
A、design a new map
B、show different approaches to the protection of forest
C、reveal locations of frontier forest in the world
D、put countries in different ranks
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3913592.html
相关试题推荐
WhichofthefollowingisNOTlikelytobecoveredbythestandard?[originaltex
WhyisJapan’sgovernmentplanningtheexpenditureof3millionyen?[originalte
WhyisJapan’sgovernmentplanningtheexpenditureof3millionyen?[br][orig
WhyisJapan’sgovernmentplanningtheexpenditureof3millionyen?[br][orig
WhyisJapan’sgovernmentplanningtheexpenditureof3millionyen?[originalte
Passage1[br][originaltext]Therearemorethanfivethousandlanguagessp
Backin1972,$1millionwasstillaneye-poppingamountofcash.ButtoRob
Tenthousandyearsago,asthelasticeagedrewtoaclose,sealevelsarou
Whatdoesitmeantorelax?Despite【C1】______thousandsoftimesduringtheco
Whatdoesitmeantorelax?Despite【C1】______thousandsoftimesduringtheco
随机试题
EXCOR1ATE:A、agreetoprovisionallyB、regardreluctantlyC、authorizeD、commendun
HowtoBeFluentToday,wewilltalkabouttheways
Afewmonthsago,millionsofpeopleinLondonheard【B1】______alloverthet
Femalecheetahs(猎豹)attheBronxZooinNewYorkjustloveCalvinKlein’sO
国家预算一般具有()特征。A.预测性B.集中性C.法律性D.计划性E.
为确保人员的录用、培训、管理等规范进行,检验检测机构应建立和保持()。A、人员
A.乳房肿胀疼痛甚至呈搏动性,患处出现有压痛的肿块,表面皮肤红热,同时可有体温升
下列关于护理道德本质的描述不正确的是()A.护理道德受一定的社会经济关系
左边给定的是纸盒的外表面,下列哪一项能由它折叠而成? A.如上图所示 B.如
下列关于定标和签发中标通知书的说法中,正确的有( )。A.评标委员会完成评标后
最新回复
(
0
)