For a financial giant the size and breadth of Citigroup, a goal to slice greenhouse gas emissions 10 percent from 2005 levels by 2011 means a lot of IT projects, including server, storage and desktop virtualization initiatives; a program to consolidate its 'strategic' global data centers from 52 in 2006 to 14 by the end of next year (along with 10 satellite data centers); and a mobile device recycling program which went global in October.

But that's only part of the story. Michelle Erickson, Citigroup's initiative director for the global sustainable IT program since May 2007, recently discussed these initiatives, and how changing employee behavior around energy consumption and unnecessary data retention is equally vital towards helping the bank achieve environmental stewardship.

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