Tired of the debate? Environmental scientist David Keith discusses a cheap, effective, shocking solution to climate change: What if we injected a huge cloud of ash into the atmosphere, to deflect sunlight and heat? As an emergency measure to slow a melting ice cap, it could work. Keith discusses why it’s a good idea, why it’s a terrible one — and who, despite the cost, might be tempted to use it.
He calls this and similar strategies: geoengineering, and why these kinds of strategies also pose a moral hazard for the environmental lobby. However, he insists that this line of thinking is not only necessary but inevitable against the near-zero progress we have had in the last 50-year-long debate on climate change.