We've been trying to green for a long time now here are steps we took.
1. Built into our corporate policy a green guide. which included powering down computer monitors when not used. Upgrading all our office equipment to energy efficient hardware. We then virtulized our whole office cutting down the hardware thus increasing efficacy. we also encourage natural light instead of using mains lighting. And today im erecting a small wind turbine
2. Virtulize hosting infrastructure instead of having several servers for main site/support portal back-ups we bought 2 new servers clustered them and now virtulize on them. We also use what we call "part time servers" so for example our backup servers are only ever switched on for duration of a backup
3. Our biggest move so far is to use a green powered datacenter we looked at several but most where very expensive, untill we got a email regarding burstNET now being a green datacenter. so where possible now we will be putting services into BurstNET. and where we cant put server into here we carbon offset by planting trees.