Most people I talk to support “sustainability” and “social justice” goals. Ecology teaches us that we need to frame these human aspirations in relation to the biological capacity of the earth: the energy, and resources that support our burgeoning populations and economies. < ?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office">

As human society sets out to achieve ecological sustainability and social justice on earth, we face two serious challenges: One, humanity already over-consumes the biological capacity of the planet; and secondly, humanity suffers from a vast gap between rich and poor.

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