To deal with the apparently apocalyptic problem of global warming, the mad scientists propose making the skies into something like an old school blackboard, only blackboards are racist, but anyway, spraying millions of tons of chalks into the stratosphere. This is to block the sun. Many other scientists see problems with this, such as possible damage to the ozone layer, and unanticipated effects on the climate, given that the global climatic system is non-linearly complex, as the climate scientist’s never stop telling us.