UN Secretary-General Antonio Guterres says, global efforts to stop climate change have been utterly inadequate so far and warns that the point of no return is no longer over the horizon.<br />'' <br />'' Mr Guterres told reporters in Madrid today that the world has the scientific knowledge and the technical means to keep global warming at 1.5 degrees Celsius enshrined in the 2015 Paris climate accord, but what is lacking is political will.<br />'' <br />'' Speaking before the start of a two-week international climate conference in the Spanish capital tomorrow, Mr Guterres said that our war against nature must stop and we know that that is possible.<br />'' <br />'' He also announced that outgoing Bank of England governor Mark Carney will become his new special envoy on climate action and climate finance from next year. <br />''  <br />