It appears global warming is not for the thin-skinned — and that’s bad news for amphibians. Frogs, toads, newts and the like have permeable skins, which makes them especially sensitive to environmental change. It also makes them good species to monitor to get an idea of the health of our planet. In 2004, researchers conducting a global assessment concluded that almost a third of the world’s known amphibian species were threatened with extinction. Now, a new study suggests that global warming may be to blame for amphibians’ precarious state. The study, published last week in the scientific journal Nature, found...