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In short, chemical reactions that are set in motion by the bird droppings, or guano, change the properties of the clouds above, and make them more reflective, the researchers said. "Clouds can actually reflect energy that's coming from the sun back to space, which is a cooling effect," said study co-lead researcher Betty Croft, a research associate in the Department of Physics and Atmospheric Science at Dalhousie University in Nova Scotia, Canada. Baffin Island is part of the vast Arctic landscape where seabirds summer...and poop.