Not Alive?

Bill McGuire (Emeritus Professor University College of London) clearly thinks it was a mistake for the Paris Accord, to specify 1.5 degrees Centigrade above pre-Industrial levels, as a 'safe' figure for global temperature rise (https://www.theguardian.com/commentisfree/2022/nov/12/climate-target-cop27-breakdown-fossil-fuel). As McGuire points out, giving an upper 'limit', gives bags of scope to 'greenhouse gas emitters'/ climate change sceptics, to haggle about the need for speed (in reductions). Actually proving that 1.5 is unattainable, only occurs when that figure is actually exceeded. By this time, it's much too late. It also removes a focus from the fact that every fraction of a degree increase in global temperature, is linked to detrimental changes in the planet's climate. McGuire opines that Cop27 must admit that the 1.5 degrees Centigrade climate target is 'dead'. 'Keeping 1.5 alive' always did seem more like a slick marketing slogan, than a realistic ambition. Although they claim to be 'worried', the 1.5 alive mantra still seems to obsess many folk (https://www.theguardian.com/environment/2022/nov/14/what-happened-on-day-seven-at-cop27). We can't suddenly 'turn things around' in 2030 or 2050!