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
39
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
[originaltext]Asayoungman,HowardWhiteofPortland,Oregon,wasabaske
国家电网有限公司深刻认识国有企业“六个力量”的历史定位,积极履行公司承担的政治责
在任何情况下,烟囱应高出屋面()。A.1m B.0.8m C.0.6m
以下关于文档的叙述中,正确的是( )。A.仅仅指软件开发过程中产生的文档 B
IS09001质量管理体系属于()。A.全面质量管理 B.PDCA管理 C
财产清查结果在处理过程中,应报送的机构不包括()。A.理事会 B.董事会 C
火灾危险性属于甲、乙、丙类的液体,液化石油气,可燃气体,毒性气体和液体以及腐蚀性
对于均匀砂土边坡,如假设滑裂面为直线,c、φ值不随含水量而变化,下列()的稳定安
民警老李工龄20年,作风散漫,纪律松弛,经常迟到早退、利用上班时间办私事,年度考
在建筑安装工程费的计算中,医疗保险费的计算基础是()。A.定额人工费 B.定
最新回复
(
0
)