The ravages of climate change are becoming more apparent each year and the world’s decision-makers are developing their response, pledging to meet the 2050 net-zero emissions target with all the tools currently available. Radical, geo-engineering solutions are also being discussed to help mitigate the impacts of climate change. Such approaches have been considered in the past, most notably as a solution to the ozone ‘hole’ over the Antarctic. This thought-piece explores the lessons learned from that global phenomenon and the technical and ethical issues of applying a potential geo-engineering solution to mitigating climate change.