EarthPetrified rocks sent back by visitors who stole them from park These chunks of ancient petrified trees proved irresistible to light-fingered visitors. But was it guilt or a mystical curse that prompted their return? Regulars
EarthWe can avoid a water crisis, but the fix will be hard to swallow High water use in drought-prone areas is folly, says Arjen Hoekstra. It's time we acknowledge that we must change what we eat and how we produce it Opinion