According to The Economist (UK) apparently "people can't be bothered to make easy energy savings", however this apparent lack of desire also negates potential cost savings.
The Economist's research produced the following graph:
What this is essentially telling you is that if companies or individuals implement the items below the red line, there would apply a threefold benefit: reduce emissions, save money and increase economic growth. Inside the IT department, this means talking to The People Who Make Building Maintenance Happen, to encourage them to use energy efficient lighting and checking how their air conditioning programs work.
Outside of the IT department, encourage the business to purchase and sponsor fuel efficient commercial vehicles. For example, if you are a courier company that hires work to subcontractors try to get your company to provide them some sort of benefit for buying fuel efficient vehicles.
And just on a side note, it was interesting that The Economist found developing countries are far more interested in implementing eco friendly enhancements - they believe the reasons included because the energy bills are boring, people don't have authority in businesses and that people buy houses because of "pretty views" not good insulation. I personally think the last hits reality - we in first world countries are quite simply spoilt.