A MONSOON dropped 35 centimetres of rain in one day across many parts of South Asia this month. Germany had its wettest May on record, and April was the driest there in a century. Temperatures reached 45 degrees in Bulgaria last month and 32 degrees in Moscow in late May, shattering long-time records.

The year still has almost five months to go, but it has already experienced a range of weather extremes that the UN’s World Meteorological Organisation says is well outside the historical norm and is a precursor to much greater weather variability as global warming transforms the planet.......