The impacts of climate change and insufficient emissions reductions have prompted many countries to explore more radical measures to curb warming. These include the release of aerosols into the upper atmosphere to reflect some of the sunlight back into space. The hope is that these technologies could buy time for emissions reductions and help avoid crossing tipping points. The risk is that they cause irreversible damage or become an excuse for delaying emissions reductions. 

What if countries were to engage in large-scale climate engineering regardless of the risks? How would the extra time be used, and how would the impacts and costs be distributed?