5-3p91-92

5.3How have we affected the world's terrestrial ecosystems?
Humans have disturbed most of the earth's land
1.62% of the world's major terrestrial ecosystems are being degraded or used unsustainably.
2.balance between expolitation and conservation
impairing損害,損傷
destruction破壞;毀滅
eating away不停地吃
grip理解;掌握
controversial爭論的