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
7
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/3299032.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
NelsonMandelawasstillinjailwhenthefirststreetwasnamed【C1】______
TheWorldHealthOrganizationsayspeopleneedmoreinformationabouthowto
[originaltext]W:Ifwegobycar,howdowecrosstheriver?M:There’saferry
在我国目前工程量清单计价过程中,分部分项工程单价由( )。A.人工费、材料费、
男性,46岁。胆囊结石病史4年。曾先后发作性胆绞痛5次,B超显示胆囊内充满型结石
下列关于蒙特卡洛模拟法的说法,正确的有( )。 Ⅰ.是一种全值估计方法,可以
A.逆向转运胆固醇B.肝内合成内源性胆固醇转运至肝外组织C.转运内源性甘油三酯D
甲的汽车被盗。第二日,甲发现乙开的是自己的汽车(虽然更换了汽车号牌但仍可认出),
下列各项中,属于专门决策预算的是()。A.预计资产负债表 B.资本支出预算
2017年6月某施工单位中标了一项传输线路及设备安装工程,建安工程费20
最新回复
(
0
)