Originally published in 2009 as: Ecological intelligence : how knowing the hidden impacts of what we buy can change everything.

The hidden price of what we buy -- "Green" is a mirage -- What we don't know -- Ecological intelligence -- A new math -- The information gap -- Full disclosure -- Twitter, cred, and buzz -- Fair and square -- Virtuous cycles -- The chemical stew -- The amygdala goes shopping -- Tough questions -- The perpetual upgrade -- Second thoughts -- Doing well by doing good.