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
25
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:https://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
PASSAGEONE[br]Accordingtothepassage,whatisthereasonfortheriseofth
Theideaofusingyourdishwashertocookamealhasbeenaroundsincethe8
(81)China’sburgeoningmiddleclasspopulationoffersagoodopportunityfo
Thesuccessofthiscarshowstheimportanceofgooddesigninhelpingtosellt
乌镇位于浙江省桐乡市北端,是一座具有悠久历史的典型江南古镇。由于气候温暖潮湿,并且有着充足的雨水和阳光,乌镇物产丰富,被誉为“鱼米、丝绸之乡”。古镇中河
大叶性肺炎叩诊呈()A.浊音或实音 B.过清音 C.鼓音 D.空瓮音
A.1/2 B. C. D.2
根茎呈不规则柱状,有盘节,根呈细长圆柱形,弯曲,表面淡黄白色至淡棕黄色或棕色,具
治疗咳嗽用药注意事项与患者教育内容包括A.治疗咳嗽往往联用抗菌药物以消除炎症
土质路堤地基表层处理要求中,当地下水影响路堤稳定时,应采取拦截引排地下水或在路堤
最新回复
(
0
)