<span style="color: #222222;">United Nations Secretary General Antonio Guterres has said that the world's efforts to stop climate change have been utterly inadequate so far. <br />''<br />''There is a danger global warming could pass the point of no return. He was speaking before the start of a International Climate Conference in Madrid scheduled for today. The U.N. Chief noted that the world has the scientific knowledge and the technical means to limit global warming, but  the political will is lacking.<br />''<br />''Mr Guterres said, he hoped the meeting in Madrid would see governments make more ambitious pledges ahead of a deadline to do so next year.<br />''<br />''Delegates from almost 200 countries will try to put the finishing touches on the rules governing the 2015 Paris climate accord at the two-week meeting.</span><br />'' <br />