“You don’t protest air pollution by holding your breath.”

As quoted in "Conversations with North American Indians" by Ted Poole in Who is the Chairman of This Meeting? : A Collection of Essays (1972) edited by Ralph Osborne, p. 43. In the article "When the Last Tree Is Cut Down, the Last Fish Eaten, and the Last Stream Poisoned, You Will Realize That You Cannot Eat Money" http://quoteinvestigator.com/2011/10/20/last-tree-cut/ "Quote Investigator" states that Greenpeace placed a paraphrased approximation on a banner in 1981, which has been widely propagated as a "Cree prophesy" or "Cree saying" and alternately attributed directly to Obomsawin, as in "A Thought for the Day" at Wordsmith (8 October 2014) http://wordsmith.org/words/virulent.html:
Context: Canada, the most affluent of countries, operates on a depletion economy which leaves destruction in its wake. Your people are driven by a terrible sense of deficiency. When the last tree is cut, the last fish is caught, and the last river is polluted; when to breathe the air is sickening, you will realize, too late, that wealth is not in bank accounts and that you can’t eat money.

Knowing Yourself: The True in the False (1996)
Context: Love is all around you like the air and is the very breath of your being. But you cannot know it, feel its unfeeling touch, until you pause in your busy-ness, are still and poised and empty of your wanting and desiring. When at rest the air is easily offended and will flee even from the fanning of a leaf, as love flees from the first thought. But when the air or love moves of its own accord it is a hurricane that drives all before it.

"Optimistic Voices".
Context: You’re out of the woods
You’re out of the dark
You’re out of the night
Step into the sun, step into the light,
Keep straight ahead
For the most glorious place
On the Face of the Earth
Or the sky. Hold onto your breath
Hold onto your heart
Hold onto your hope,
March up to the gate
And bid it open.

1963, Limited Nuclear Test Ban Treaty speech
Context: Continued unrestricted testing by the nuclear powers, joined in time by other nations which may be less adept in limiting pollution, will increasingly contaminate the air that all of us must breathe. Even then, the number of children and grandchildren with cancer in their bones, with leukemia in their blood, or with poison in their lungs might seem statistically small to some, in comparison with natural health hazards. But this is not a natural health hazard — and it is not a statistical issue. The loss of even one human life, or the malformation of even one baby — who may be born long after we are gone — should be of concern to us all. Our children and grandchildren are not merely statistics toward which we can be indifferent.

"We are Power" speech (1980)

Source: Steppenwolf (1927), p.149