The Amazon at a Tipping Point 

The Amazon rainforest is a crucial life-support ecosystem. Without its wondrous strength and power to generate hydrologic systems across the sky (as far north as Iowa), absorb and store carbon (CO2), and its miraculous life-giving endless supply of oxygen, civilization would cease to exist beyond scattered tribes, here and there. More

Source: The Amazon at a Tipping Point – CounterPunch.org