Cop27 climate summit: window for avoiding catastrophe is closing fast

The effects of global heating could soon reach a tipping point, but scientists fear that the meeting in Egypt will become bogged down in recriminations

It has been an alarming time for climate scientists. One by one, the grim scenarios they had outlined for the near future have been overtaken by events: extreme storms, droughts, floods and ice-sheet collapses whose sudden appearances have outstripped researchers' worst predictions. Catastrophic climate change is happening more rapidly and with greater intensity than their grimmest warnings, it transpires.

Examples include this summer's record high temperature of 40.3C in the UK, a massive jump of 1.6C on the previous hottest day; torrential rains that triggered the most severe flooding in Pakistan's recent history; and last year's Hurricane Ida, one of the most destructive storms to have struck the US.