From Geoff Harding, Sydney, Australia
As attempts over the past 20 years have demonstrated, carbon capture and storage is fraught with difficulty and unlikely to make a significant contribution in the future. A worthwhile alternative strategy in which citizens and various levels of government worldwide can participate is carbon sequestration through tree propagation 20 April, p 8.
In cities, every backyard and nature strip could be partially or completely forested. Non-productive farmland could be put to far more important use as a carbon sink. Wealthy nations could subsidise reforestation in the Amazon and other damaged rainforests. This is surely a low-cost and effective option and, as is often discussed, greened environments bring considerable health benefits.
