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The café and the final cup are the biggest culprits in the energy vacuum that is the coffee supply (and demand) chain. Of the 10 to 11 pounds of carbon emissions that the average pound of coffee creates, as much as 50% is created at the retail and consumer level.

This not insignificant energy usage is the result of multiple factors. Heating and air conditioning in an environment with constant temperature fluctuations (think of the gust one way or another every time a new customer walks in the door); outlets in constant use behind the counter (toasters, blenders, grinders, brewers, fridges, dishwasher if the baristas are lucky) and in front (laptops, phone chargers); espresso machines and grinders left on 24-7 for efficiency’s sake; lights left on in the bathroom and the basement when no one’s using them; computerized POS, cash register, and/or credit-card machines; mountains upon mountains of paper-cup waste; and, of course, the perpetual flowing of water through coffee equipment, toilets, and sinks.

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– http://drinks.seriouseats.com/2013/10/calculating-coffees-carbon-footprint-energy-usage-to-farm-pick-ship-roast-brew-coffee.html