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The amount of energy the outdoor gear store saves through 'free cooling' is enough to power six stores for up to a year

Outdoor retailer REI is saving 1.8 million KW-h per year after installing energy-efficient cooling systems at its Seattle datacenter. The project reduced energy consumption tied to cooling by 93% and had a payback period of less than 1 year.

Many of the world's biggest airlines are experimenting with bio-derived jet fuels in a bid to reduce their costs and emissions. "Aviation will double in size worldwide in the next two decades, and if we're not able to provide a sustainable means to fly, we will create a ceiling for growth in the industry," says Ignaas Caryn, director of innovation at KLM Royal Dutch Airlines.