Socialism failed because it couldn't tell the economic truth; capitalism may fail because it couldn't tell the ecological truth. - Lester Brown
One of the penalties of an ecological education is that one lives alone in a world of wounds. - Aldo Leopold
The question that will decide our destiny is not whether we shall expand into space. It is: shall we be one species or a million? A million species will not exhaust the ecological niches that are awaiting the arrival of intelligence. - Freeman Dyson
The re-establishment of an ecological balance depends on the ability of society to counteract the progressive materialization of values. The ecological balance cannot be re-established unless we recognize again that only persons have ends and only persons can work towards them. - Ivan Illich