Clean energy from coffee grounds sounds wonderful (βWeek in higher educationβ, News, 10 September), but soaking the grounds in sodium hydroxide (made by electrolysis, very energy-intensive) and then heating the result to 900ΒΊC hardly seems environmentally friendly. Better a double espresso and then run on a treadmill for 10 minutes, methinks?
Peter B. Baker
Prestwood
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