A green sea turtle in Hawaii. | Reinhard Dirscherl/ullstein bild via Getty Images	
Scientists who study wildlife are often the bearers of bad news — this species or that is headed for extinction for the usual reasons, like deforestation or climate change. Just last week, for example, I wrote about new science showing that two valuable coral species in Florida were mostly killed off by global warming. 
But earlier this month, researchers announced something overwhelmingly positive: Green sea turtles, the iconic marine species made famous by Finding Nemo that were once at risk of extinct...
                                                        
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