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
16
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/3913593.html
相关试题推荐
Itisacommonknowledgethattrianglehasthreeangles,asquarehasfoursides
Atthreethousandfeet,wideplainsbegintoappear,andthereisneveramoment
Thousandsof________atthestadiumcametotheirfeettopaytributetoanoutst
OfalltheemployedworkersintheUnitedStates,12.5millionarepartofa
OfalltheemployedworkersintheUnitedStates,12.5millionarepartofa
OfalltheemployedworkersintheUnitedStates,12.5millionarepartofa
OfalltheemployedworkersintheUnitedStates,12.5millionarepartofa
OfalltheemployedworkersintheUnitedStates,12.5millionarepartofa
OfalltheemployedworkersintheUnitedStates,12.5millionarepartofa
OfalltheemployedworkersintheUnitedStates,12.5millionarepartofa
随机试题
AtachesstournamentinTunisiain1967,BobbyFischer,then24,waspitted
下列关于设备选择和布置的要求,正确的是()。A.对于一般送排风系统,通风机附
用治热陷心包之高热、神昏、谵语,最宜选用的药物是()A.黄连、胡黄连 B
可交换债券和可转换债券的不同之处有()。 ①发行主体不同②转股的股份来源不
炮制后能添阴滋血,抑制其浮阳之性,增强清肝退热功效的饮片是A.盐知母B.醋乳香C
红外测温图像特征判断法,主要适用于()设备。电压致热型$;$电流致热型$;$电
企业发展战略决定了组织结构的不同模式,以产品为中心设立事业部的大型跨国公司,宜采
关于桩周土沉降引起的桩侧负摩阻力和中性点的叙述,下列哪个选项是正确的? (A)
下列关于个人汽车贷款发放的说法,不正确的是()。A.贷款发放时,按照合同要求借
(2013年真题)关于国际工程招标,下列说法中正确的是()。A.投交标书的方式须
最新回复
(
0
)