The United Nations Secretary-General Antonio Guterres has told world leaders to end their addiction to coal. He said the fossil fuel was a "major threat" to climate change and warned that the coal addiction "must be overcome". Mr Guterres was in Thailand for the ASEAN Summit. He said that many countries in danger from climate change are in Asia. He told the world leaders that: "Countries in these areas are countries that are in one of the most vulnerable areas to climate change." He added that: "Unless we are able to...defeat climate change, in 2050, the research has forecasted that 300 million people in the world will be flooded by sea water." Mr Guterres said climate change was, "the biggest threat to the planet at the present moment". He said using coal was a big problem. "We have to put a price on carbon. We need to stop subsidies for fossil fuels." He urged, "stopping the construction of coal-power electricity plants in order to be able to defeat climate change." The UN chief was speaking on a day that saw "unbearable" and "hazardous" levels of air pollution in India's capital of Delhi. An Indian health ministry official, Varun Jhaveri, said pollution monitors did not have enough digits to accurately record the pollution. He tweeted: "I think we are heading towards Delhi recording the most polluted day in the history of the world!! This is a disaster!"