The idea of climate engineering is controversial, but as greenhouse gases continue to accumulate in our atmosphere, scientists are beginning to look at possible emergency measures. A new University of Washington study looks at marine cloud brightening, which is being investigated by an on-campus group as a promising strategy to offset global warming. The idea, which could be a short-term measure to offset global warming in a future extreme emergency, is to spray saltwater into the air to make marine clouds reflect more incoming solar rays.