The Observer view on global warming

Time is running out for Britain to sign up to the Paris climate change accordThe sea ice covering the most northerly part of our planet shrank last week to its second lowest level on record. Once stable at around 7.5m sq km in summer, the Arctic ice cap has been dwindling for several decades and dropped to an area of 4.1m sq km a few days ago, a victim of the rising fossil-fuel emissions and increasing temperatures that now beset the Earth. At the same time, the US space agency Nasa announced th