This beloved animal is back from the brink of extinction — with one big caveat

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