Advertisement Friday marked 100 days until the critical COP26 United Nations climate summit starts in Glasgow and the milestone was marked by renewed urgency in climate action. Alok Sharma, the Conservative UK cabinet minister who will be the formal host of the Glasgow talks, used it to write to relevant ministers around the world and call upon them to raise ambitions. “Although significant progress has been made, we must be honest that collectively we have not yet delivered at the scale and pace that science requires,” read his letter. “The world will be watching in Glasgow and it is our shared responsibility to rise to the challenge.”