第15週 - 5.3 - How Have We Affected the World's Terrestrial Ecosystems?

　
　
　5.3
　　　How Have We Affected the World's Terrestrial Ecosystems?
　
Humans dominate most of the planet. In many areas, human activities are impairing some of the ecological and economic services provided by the world's deserts, grasslands, forests, and mountains.
　
　　人類控制了大多數的星球。在許多地方，人類的活動損害了由世界上沙漠、草原、森林和山所提供的某些生態及經濟的服務。