> There is already around -0.9W/m2 of radiative forcing due to shipping (sulphur in shipping fuels) which is massive compared to volcanos. It follows then that

> There is already around -0.9W/m2 of radiative forcing due to shipping (sulphur in shipping fuels) which is massive compared to volcanos. It follows then that the effort to clean up ocean freight will backfire by accelerating global warming unless we do deliberate geoengineering to replicate the unintended forcing.