This concentration has caused pastures near to the towns to be overgrazed, and more distant ones to be under-used.
ECONOMIST: Nomadism in Mongolia
Scientists in Hawaii (USA) discovered that, in the absence of patrolling tiger sharks, turtles overgrazed seagrasses until these were destroyed.
UNESCO: Open Access to Scientific Information
If all (or most) shepherds behave in this way, then the commons will become overgrazed, and its ability to support sheep will soon be destroyed.
FORBES: Royal Society's Terrible Report on Population and Consumption
As a result huge amount of marginal land has been taken in as pasture, overgrazed to the point of exhaustion, and now farmers are being forced to watch the topsoil literally blow away on the spring winds.
CNN: Desertification: How to stop the shifting sands
应用推荐
模块上移
模块下移
不移动