Business leaders who want to go green should take their cues from the Earth itself, argues Gregory Unruh, professor of global business at Thunderbird School of Global Management and author of "Earth, Inc." The biosphere has been running a sustainable and incessantly innovative manufacturing business for 3.5 billion years, Unruh writes. "All we need to do is decipher the principles that account for its sustainability, translate them for business and splice them into the corporate DNA," Unruh says.

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