The closer a volcano is to erupting, the greener the trees around it look from space - Live Science

Scientists have found a way to monitor volcanic carbon dioxide levels — one of the first signs a volcano might be about to blow — that doesn't involve trekking up a mountain.Scientists can tell whether a volcano is about to erupt from the greenness of the trees around it, with more vibrant leaves indicating a potentially imminent blast. Until now, these subtle color c…