To protect the environment, considerable effort and expense has been applied to removal of sulfur dioxide and other light-reflecting aerosols from the atmosphere, and the work has proven rather successful. Before regaling ourselves with a hearty round of applause, however, we might wish to consider the side-effect: the polar bears are gonna drown.
That's because when we clean light-reflecting aerosols from the air, a funny thing happens: Arctic sea ice is more exposed to solar heat, and more of it melts. Environment Canada researchers have published a study in which they claim that as much as 400,000 square miles will melt as a result of aerosol reductions in the atmosphere. All in all, it's rather a wonder that the planet was able to survive in the earlier days when there were no professional scientists around to study it.