EnvironmentArctic tundra is now a source – not a sink – of carbon emissions For millennia, Arctic ecosystems have stored more carbon dioxide than they release, but that has shifted as warming temperatures have boosted wildfires and melted permafrost in the north News
TechnologyRobot balloons are snapping centimetre-resolution photos of the US Near Space Labs’s autonomous balloon fleet is already taking high-resolution images of the ground, and its range will expand to the entire continental US early next year News