We won’t save the Earth with a better kind of disposable coffee cup

Do you believe in miracles? If so, please form an orderly queue. Plenty of people imagine we can carry on as we are, as long as we substitute one material for another. Last month, a request to Starbucks and Costa to replace their plastic coffee cups with cups made from corn starch was retweeted 60,000 times, before it was deleted.

Those who supported this call failed to ask themselves where the corn starch would come from, how much land would be needed to grow it, or how much food production it would displace. They overlooked the damage this cultivation would inflict: growing corn (maize) is notorious for causing soil erosion, and often requires heavy doses of pesticides and fertilisers.

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