From Ro Scott, Cromarty, Ross-shire, UK
With reference to the letter from Eric Kvaalen on the long-term preservation of harvested timber as a carbon store, my favoured domestic carbon store is paper, in the form of books (Letters, 12 September). Around the world, libraries must contain a massive amount of sequestered carbon dioxide, some of it of great antiquity. Barring wars and pyromaniacs, these seem set to persist for the long term.
