Climate Central: Shark Week, the annual television extravaganza featuring the most terrifying and toothiest fish in the sea, will wind down over the weekend. But even though sharks may disappear from the collective consciousness for another year, that doesn't mean they'll cease to exist.
Like many species, sharks face a looming threat: a changing climate. The most ancient sharks date back to 450 million years ago, during a period when the oceans were much warmer and much more acidic -- an environment today's sharks...