Global Warming Could Bring Single-Sex Doom to Ancient Reptile

On a scattering of small islands off the north coast of New Zealand, members of an ancient reptile species are currently scuttling around, oblivious to the impending doom that researchers predict for them. Like many reptiles, the tuatara's sex is determined by the nest temperature while the embryo is developing; now researchers have used computer modeling to determine that global warming could raise island temperatures to the extent that the nests will produce only male hatchlings by 2085. As temperatures tick upwards,