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Managing a two-year-old is like nailing Jello to a tree, goes an old
saying.
Maybe getting adults to agree on a definition of sustainability is like
that, too. Individuals and groups keep trying, but no one has hammered
out one that everybody accepts.
Still, common themes run through most definitions of sustainability.
They usually deal with nature, the economy, society or, perhaps most
often, all three together. Most are not about maintaining life precisely
as it is today. They are about the rate of change, and about equity
between generations. Many see sustainability as a continually evolving
process.
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