Changes at Engine's Great Portland Street, London, headquarters include automatic light dimming, hot water taps in place of kettles and computer power saving measures.
"We have implemented a large number of small changes throughout the company, which make a big difference when combined," said Slice new business executive Dorian Needs. "We are one of the few agencies to have this accreditation, and we are hoping it will help win business."
He added: "In the future this accreditation could become standard amongst agencies."
Slice have recently promoted events for sport's giant Nike and.
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