Clean energy from coffee grounds sounds wonderful (“Week in higher education”, News, 10 September), but soaking the grounds in sodium hydroxide (made by electrolysis, very energy-intensive) and then heating the result to 900?C hardly seems environmentally friendly. Better a double espresso and then run on a treadmill for 10 minutes, methinks?
Peter B. Baker
Prestwood
Send to
Letters should be sent to: THE.Letters@tesglobal.com
Letters for publication in 成人VR视频 should arrive by 9am Monday. View terms and conditions.