"Unless we stop the degradation of our oceans, marine ecological systems will begin collapsing and when enough of them fail, the oceans will die. And if the oceans die, then civilization collapses and we all die"

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...the chief cause for the impending collapse of the world - the cause sufficient in and by itself - is the enormous growth of the human population: the human flood. The worst enemy of life is too much life: the excess of human life.

— Pentti Linkola