There is also the use of what Saxe called "collaborative technologies", such as personal carbon calculators for employees on the internal website.
Saxe said a lot of work is going into the bank's supplier and vendor ecosystem to implement green issues into contracts - ensuring vendors comply with emerging environmental standards.
Saxe referred to Firebird, a programme to examine how Morgan Stanley's 12 data centres around the world can be made more efficient and cost effective - with air cooling seen as one of the future options.
He said the bank is asking whether computer resources are being used as efficiently as possible, with virtualisation seen as a better way of allocating resources.
Head of group sustainable development at HSBC, Jon Williams, explained what his company is doing to improve its environmental standing. "We need to be smarter," he said.
According to Williams, HSBC became the world's first carbon-neutral bank in October 2005 and has opened its own 150-megawatts wind farm in Wales.
See Silicon for the full news.