Reuters: Penguin populations have plummeted at a key breeding colony in Argentina, mirroring declines in many species of the marine flightless birds due to climate change, pollution and other factors, a study shows. Dee Boersma, a University of Washington professor who led the research, said the plight of the penguins is an indicator of big changes in the world’s oceans due to human activities. “Penguins are in trouble,” Boersma, whose study appears in the journal BioScience, said in …