ClimateDesk: Move over, polar bears: Its time for Emperor penguins to become the new poster children of climate change. Recently, polar biologists at the University of Minnesota used satellite images of poop stains (scientists are nothing if not resourceful) to show that some colonies of Emperor penguins in Antarctica are uprooting historic nesting sites, possibly to escape warming temperatures. Today, a new study in Nature makes an even more grim prognostication about the future of the species: Thanks to declining...