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
<网曝门>Send to
Letters should be sent to: THE.Letters@tesglobal.com
Letters for publication in Times Higher Education should arrive by 9am Monday. View terms and conditions.
Register to continue
Why register?
- Registration is free and only takes a moment
- Once registered, you can read 3 articles a month
- Sign up for our newsletter
Subscribe
Or subscribe for unlimited access to:
- Unlimited access to news, views, insights & reviews
- Digital editions
- Digital access to 罢贬贰’蝉 university and college rankings analysis
Already registered or a current subscriber?
Please or to read this article.