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
56
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] All the following organization are involved in the development of the map except ______.
选项
A、the World Conservation Monitoring Centre
B、the United Nations Development Program
C、the World Wildlife Fund
D、the World Resources Institute
答案
B
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3299031.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
Inductivereasoningistheprocessbywhichwemakeanecessarylim-【M1】___
WillAIRobotsTurnHumansintoPets?A)Inaroomatth
严寒、寒冷地区公共建筑的体形系数一般应小于或等于多少?()A.0.30 B
下列建筑物或设施中,不可突出建筑控制线的是( )。A.基地内连接城市的管线
()不属于使用软件测试工具的目的。A.帮助测试寻找问题 B.协助问题
A、700kPa B、733kPa C、210kPa D、833kPa
A元素组成不同,且无明显属性规律,优先考虑数量规律。观察发现,第三幅图形为“田”字变形图,考虑笔画数。题干图形的笔画数依次为2、1、2、1、2,因此问号处图形
关于Internet接入,下列说法错误的是()。A:ADSL技术采用频分复用技术
自我意识第二次飞跃的主要表现为()。A:十分关心自己的人格特征和情绪特征B:强
关于高处作业安全技术要求的说法,错误的有()。A.安全绳有效长度不应大于2m
最新回复
(
0
)