In this episode of the Enlighten Science Podcast, we spoke to Professor Stephen Salter, Emeritus Professor at the University of Edinburgh about how geoengineering can be used to reverse the effects of climate change. Stephen provides an in-depth discussion of marine cloud brightening, a technique used to increase the brightness of clouds, which increases the amount of heat radiation they reflect into outer space. We discuss whether this might be an effective way to reduce the effects of global warming, and how this might be achieved practically.