From Arthur Dahl, Geneva, Switzerland
The study that found there is a weekend boost to plant productivity in Europe because of reduced air pollution by aerosols, which block sunlight, should be a warning to those who seek to address global heating by injecting aerosols into the atmosphere (25 November, p 11).
This research shows how sensitive plants are to any drop in sunlight. Addressing climate change through atmospheric geoengineering will reduce plant photosynthesis on land and at sea globally, with probably catastrophic impacts on nature and agriculture.
