(CNN) — Pygmy seahorses, about the size of a fingernail, are some of the smallest vertebrates in the world. First discovered in 1969, little was known about the creatures. But in the early 2000s, ...

The San Luis Obispo County Public Health Department has issued a warning advising residents to avoid ocean water for at least 72 hours amid heavy rains and thunderstorms. The announcement, shared on ...

Editor’s Note: Call to Earth is a CNN editorial series committed to reporting on the environmental challenges facing our planet, together with the solutions. Rolex’s Perpetual Planet Initiative has ...