Climate

Ask how often a river floods catastrophically and the standard answer comes wrapped in a number: the 100-year flood, an event so severe it strikes, on average, once a century. It is the figure…

For two decades, the story of Europe's air has been one of slow, hard-won improvement. Cleaner engines, tighter industrial rules, and the retreat of coal have pulled soot and sulphur down year after…

"Cities cause most of the world's carbon emissions" is one of those facts that sounds precise until you try to pin it down. Most? Two-thirds? Three-quarters? The honest answer is that it depends on a…