91av

Letter: For the record

Published 14 May 2025

The northern hemisphere is thought to store around 1.5 trillion tonnes of carbon in permafrost (5 April, p 17).

Issue no. 3543 published 17 May 2025

91av issue 3543 cover

Sign up to our weekly newsletter

Receive a weekly dose of discovery in your inbox. We'll also keep you up to date with 91av events and special offers.

Sign up
Piano Exit Overlay Banner Mobile Piano Exit Overlay Banner Desktop