Here are some simple ways (From Umbra of Grist)
If you're looking to green your office, start with the EPA carbon footprint calculator. It's an Excel spreadsheet, based on well-respected work from the World Resources Institute. Next, look up some tips on how to cut down all over the Internet (or look at my previous blogs: one, two, three). Umbra recommends the Portland's Green Office Guide. Their improvement categories are office equipment, paper products, heating and cooling, water, and car-related items. Office equipment includes computers, refrigerators, and everything in between. Together with the self-explanatory paper products, office equipment should be responsibly sourced and responsibly discarded. Heating and cooling improvements could take place at the thermostat, in crawlspaces, and at the store, among other places. The water system includes hot water, sink, and toilet -- as well as landscape use. Car and transport impacts include commuting as well as business-related mileage, and don't forget the heat island parking lot. There's also the Clean Air Cool Planet and the Sierra Club.
The world is in danger, we need to be its superheroes.
Love,
TreeHugger