Letter: Time to get on with tests of this geoengineering

From Mike Graham, Peterborough, Cambridgeshire, UK

From

8 June, p 15

So sulphur dioxide emissions from ships burning heavy marine fuel cooled Earth by brightening ocean clouds, but declines in such pollution since 2020 have resulted in warming. This unplanned experiment in geoengineering indicates that we should now fund tests of marine cloud brightening using ships to spray seawater into clouds to cut temperatures, as proposed by the late Stephen Salter.