Citigroup approaches sustainable technology as it would a CRM project-the more holistic and cross functional, the better. "In 2007-2008, green IT was thought by many people to mean reducing data center power consumption," says Michelle Erickson, the bank's sustainable technology director. "We prefer the term 'sustainable IT' as we have a larger vision than just cutting power usage."

In September 2007, Citi launched a global sustainable IT initiative, based on a formal framework encompassing power management, paper substitution, travel substitution, and sustainable supply chain. The program is one of several initiatives designed to reduce Citi's own environmental footprint-including constructing sustainable office buildings-to which Citi allocated a ten-year budget of $10 billion in 2007. It's part of a goal to reduce absolute greenhouse gas emissions globally by 10 percent by 2011 from 2005 levels.

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