What we know is that the environmental movement had a series of dazzling victories in the late '60s and in the '70s… — Naomi Klein Copy Share Image
Most of what I know about environmental conservation I learned from my father, who has been a leader within the movement for… — Edward Norton Copy Share Image
We do not know how much of the environmental change is due to human activities and how much [is due] to long-term… — Freeman Dyson Copy Share Image
![“We do not know how much of the environmental change is due to human activities and how much [is due] to long-term natural processes over which we have no control.” quote by Freeman Dyson](https://sms4smile.com/quotes/img-quotes/8c1/freeman-dyson-1435_activity_we-do-not-know-how-much-of-the-environme_1467450.jpg)