From Eric Kvaalen,<br/>Les Essarts-le-Roi, France
David Flint is right that we need to remove carbon dioxide from the air in order to keep the world at a good temperature. The easiest way to do this, in my opinion, is to harvest biomass. The biomass can be stored as it is or transformed into another form, like charcoal, or even burned while capturing the carbon dioxide in a much more effective absorption tower(Letters, 25 October).
