1. Never doubt that a small group of thoughtful, committed citizens can change the world; indeed, it's the only thing that ever has. - Margaret Mead 

2. Nature is the mother and the habitat of man, even if sometimes a stepmother and an unfriendly home. - John Dewey 

3. Climate change is happening, humans are causing it, and I think this is perhaps the most serious environmental issue facing us. - Bill Nye 

4. Thank God men cannot fly, and lay waste the sky as well as the earth. - Henry David Thoreau 

5. Every creature is better alive than dead, men and moose and pine trees, and he who understands it aright will rather preserve its life than destroy it. - Henry David Thoreau 

6. It appears to be a law that you cannot have a deep sympathy with both man and nature. - Henry David Thoreau 

7. If a man walks in the woods for love of them half of each day, he is in danger of being regarded as a loafer. But if he spends his days as a speculator, shearing off those woods and making the earth bald before her time, he is deemed an industrious and enterprising citizen. - Henry David Thoreau 

8. The environment is everything that isn't me. - Albert Einstein 

9. When we try to pick out anything by itself, we find it hitched to everything else in the universe. - John Muir 

10. Take a course in good water and air; and in the eternal youth of Nature you may renew your own. Go quietly, alone; no harm will befall you. - John Muir 

11. Keep close to Nature's heart... and break clear away, once in awhile, and climb a mountain or spend a week in the woods. Wash your spirit clean. - John Muir 

12. Climate change is a terrible problem, and it absolutely needs to be solved. It deserves to be a huge priority. - Bill Gates 

13. The reality is gas prices should be much more expensive then they are because we're not incorporating the true damage to the environment and the hidden costs of mining oil and transporting it to the U.S. Whenever you have an unpriced externality, you have a bit of a market failure, to the degree that eternality remains unpriced. - Elon Musk 

14. We're running the most dangerous experiment in history right now, which is to see how much carbon dioxide the atmosphere... can handle before there is an environmental catastrophe. - Elon Musk 

15. I'm anti-tax, but I'm pro-carbon tax. - Elon Musk 

16. As you heat the planet up, it's just like boiling a pot. - Elon Musk 

17. Biofuels such as ethanol require enormous amounts of cropland and end up displacing either food crops or natural wilderness, neither of which is good. - Elon Musk 

18. We won't have a society if we destroy the environment. - Margaret Mead 

19. By polluting clear water with slime you will never find good drinking water. - Aeschylus 

20. We could have saved the Earth but we were too damned cheap. - Kurt Vonnegut 

21. It is horrifying that we have to fight our own government to save the environment. - Ansel Adams 

22. If we're destroying our trees and destroying our environment and hurting animals and hurting one another and all that stuff, there's got to be a very powerful energy to fight that. I think we need more love in the world. We need more kindness, more compassion, more joy, more laughter. I definitely want to contribute to that. - Ellen DeGeneres

23. There are plenty of problems in the world, and doubtless climate change - or whatever the currently voguish phrase for it all is - certainly is one of them. But it's low on my list. - P. J. O'Rourke 

24. We have no reason to think that climate change is harmful if you look at the world as a whole. Most places, in fact, are better off being warmer than being colder. And historically, the really bad times for the environment and for people have been the cold periods rather than the warm periods. - Freeman Dyson 

25. It's coming home to roost over the next 50 years or so. It's not just climate change; it's sheer space, places to grow food for this enormous horde. Either we limit our population growth or the natural world will do it for us, and the natural world is doing it for us right now. - David Attenborough 

26. They claim this mother of ours, the Earth, for their own use, and fence their neighbors away from her, and deface her with their buildings and their refuse. - Sitting Bull 

27. If all mankind were to disappear, the world would regenerate back to the rich state of equilibrium that existed ten thousand years ago. If insects were to vanish, the environment would collapse into chaos. - E. O. Wilson 

28. Destroying rainforest for economic gain is like burning a Renaissance painting to cook a meal. - E. O. Wilson 

29. Every drop in the ocean counts. - Yoko Ono 

30. Moral codes adjust themselves to environmental conditions. - Will Durant 

31. Water and air, the two essential fluids on which all life depends, have become global garbage cans. - Jacques Yves Cousteau 

32. The real cure for our environmental problems is to understand that our job is to salvage Mother Nature. We are facing a formidable enemy in this field. It is the hunters... and to convince them to leave their guns on the wall is going to be very difficult. - Jacques Yves Cousteau 

33. Mankind has probably done more damage to the Earth in the 20th century than in all of previous human history. - Jacques Yves Cousteau 

34. Just as modern mass production requires the standardization of commodities, so the social process requires standardization of man, and this standardization is called equality. - Erich Fromm 

35. Our world faces a true planetary emergency. I know the phrase sounds shrill, and I know it's a challenge to the moral imagination. - Al Gore 

36. I think the cost of energy will come down when we make this transition to renewable energy. - Al Gore 

37. I think the environment should be put in the category of our national security. Defense of our resources is just as important as defense abroad. Otherwise what is there to defend? - Robert Redford 

38. In a few decades, the relationship between the environment, resources and conflict may seem almost as obvious as the connection we see today between human rights, democracy and peace. - Wangari Maathai 

39. In Kenya women are the first victims of environmental degradation, because they are the ones who walk for hours looking for water, who fetch firewood, who provide food for their families. - Wangari Maathai 

40. Ten percent of the big fish still remain. There are still some blue whales. There are still some krill in Antarctica. There are a few oysters in Chesapeake Bay. Half the coral reefs are still in pretty good shape, a jeweled belt around the middle of the planet. There's still time, but not a lot, to turn things around. - Sylvia Earle 

41. In addition to contributing to erosion, pollution, food poisoning, and the dead zone, corn requires huge amounts of fossil fuel - it takes a half gallon of fossil fuel to produce a bushel of corn. - Michael Pollan 

42. Raising awareness on the most pressing environmental issues of our time is more important than ever. - Leonardo DiCaprio 

43. In the environmental movement, every time you lose a battle it's for good, but our victories always seem to be temporary and we keep fighting them over and over again. - David Suzuki 

44. It's not unexpected that shooting massive amounts of water, sand, and chemicals at high pressure into the earth to shatter shale and release natural gas might shake things up. But earthquakes aren't the worst problem with fracking. - David Suzuki 

45. Population, when unchecked, goes on doubling itself every 25 years or increases in a geometrical ratio. - Thomas Malthus 

46. If you can't be in awe of Mother Nature, there's something wrong with you. - Alex Trebek 

47. People blame their environment. There is only one person to blame - and only one - themselves. - Robert Collier 

48. The Earth does not belong to us: we belong to the Earth. - Marlee Matlin 

49. Mother Nature is not sweet. - John Shelby Spong 

50. We may achieve climate, but weather is thrust upon us. - O. Henry 

51. We are using resources as if we had two planets, not one. There can be no 'plan B' because there is no 'planet B.' - Ban Ki-moon 

52. Saving our planet, lifting people out of poverty, advancing economic growth... these are one and the same fight. We must connect the dots between climate change, water scarcity, energy shortages, global health, food security and women's empowerment. Solutions to one problem must be solutions for all. - Ban Ki-moon 

53. There is a muscular energy in sunlight corresponding to the spiritual energy of wind. - Annie Dillard 

54. We are now heading down a centuries-long path toward increasing the productivity of our natural capital - the resource systems upon which we depend to live - instead of our human capital. - Paul Hawken 

55. We assume that everything's becoming more efficient, and in an immediate sense that's true; our lives are better in many ways. But that improvement has been gained through a massively inefficient use of natural resources. - Paul Hawken 

56. All is connected... no one thing can change by itself. - Paul Hawken 

57. We need to accept the seemingly obvious fact that a toxic environment can make people sick and that no amount of medical intervention can protect us. The health care community must become a powerful political lobby for environmental policy and legislation. - Andrew Weil 

58. Nature is regulating our climate for free. Mother Nature, she's been doing that for free, for a long, long time. Now do you really want to get in there and do geo-engineering and all this kind of stuff? - Thomas Friedman 

59. I think so long as fossil fuels are cheap, people will use them and it will postpone a movement towards new technologies. - Paul Krugman 

60. Conservation is a state of harmony between men and land. - Aldo Leopold 

61. Harmony with land is like harmony with a friend; you cannot cherish his right hand and chop off his left. - Aldo Leopold 

. I think Captain Cousteau might be the father of the environmental movement. - Ted Turner 

63. 'Being green' is commendable, but I hope that people don't take too much pride and self-adoration because they shut off the water when they brushed their teeth. The truth of the matter is, conservation alone will do little to save our planet. - Naveen Jain 

64. The time is right for electric cars - in fact the time is critical. - Carlos Ghosn 

65. We have enslaved the rest of the animal creation, and have treated our distant cousins in fur and feathers so badly that beyond doubt, if they were able to formulate a religion, they would depict the Devil in human form. - William Inge 

66. A true conservationist is a man who knows that the world is not given by his fathers, but borrowed from his children. - John James Audubon 

67. Natural gas is a better transportation fuel than gasoline, so if that's the case, it's cheaper, it's cleaner and it's a domestic resource. - T. Boone Pickens 

68. The cheapest natural gas in the world is in the United States. - T. Boone Pickens 

69. We live in a world bathed in 5,000 times more energy than we consume as a species in the year, in the form of solar energy. It's just not in usable form yet. - Peter Diamandis 

70. Every time I have some moment on a seashore, or in the mountains, or sometimes in a quiet forest, I think this is why the environment has to be preserved. - Bill Bradley 

71. The only way forward, if we are going to improve the quality of the environment, is to get everybody involved. - Richard Rogers 

72. Environmental policy must strike a balance between the earth's best interests and our citizen's pressing needs. - Jim Clyburn 

73. I don't think we're going to save anything if we go around talking about saving plants and animals only; we've got to translate that into what's in it for us. - Jim Fowler 

74. The quicker we humans learn that saving open space and wildlife is critical to our welfare and quality of life, maybe we'll start thinking of doing something about it. - Jim Fowler 

75. I did not become a vegetarian for my health, I did it for the health of the chickens. - Isaac Bashevis Singer