One of the business trade publications for the banking industry, Bank Technology News, has just published a useful report about how some of the biggest banks in the country are using technology to paint themselves greener. Citigroup, which is the top-ranked company, actually employs someone with the title "sustainable technology director." Their application of technology with sustainability in mind is one piece in an overall program to cut the company's global greenhouse gas emissions by 10 percent on an absolute basis by next year (compared with 2005 levels). As you might expect, virtualization plays a big role, so does its policy of email deletion, which is intended to help lighten the load of systems need to deal with the Citi e-mail onslaught. Worth reading for practical ideas.