"The idea of the universe as an interconnected whole is not new; for millennia it's been one of the core assumptions of Eastern philosophies. What is new is that Western science is slowly beginning to realize that some elements of that ancient lore might be correct."

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As long as man was small in numbers and limited in technology, he could realistically regard the earth as an infinite reservoir, an infinite source of inputs and an infinite cesspool for outputs. Today we can no longer make this assumption. Earth has become a space ship, not only in our imagination but also in the hard realities of the social, biological, and physical system in which man is enmeshed.

— Kenneth E. Boulding