EarthThe world's tallest tree costs more than a private island We valued 7 of the world's most famous trees, from strangler figs draping ancient ruins to a 9000-year-old spruce. The most pricey comes in at £11 million Features
EarthA mix-up means US air pollution is way worse than thought Levels of nitrogen oxides in the air are still falling across the US, but satellite measurements show the reduction has slowed down unexpectedly since 2011 News