“In 2006, Paul Rak, president of VeriForm Inc, a Canadian steel fabricator, set his company on the kind of do-gooder mission that could have given his corporate accountant fits. Rak had just seen Al Gore’s climate change film, An Inconvenient Truth, his first child had recently been born, and Rak decided he was obliged to find ways to deeply cut his company’s greenhouse gas emissions, even though he knew it was going to cost plenty.

Using renewable energy gives your business a certain cachet, but don't underestimate the importance of energy efficiency, says Benj Sykes