A new UN report has said the world is badly lagging behind in the race to avert climate disaster as a result of runaway warming. The report, which came yesterday ahead of today's major UN climate summit, said that the five-year period ending 2019 is set to be the hottest ever.<br />''<br />''The summit will be attended by more than 60 world leaders, as Secretary-General Antonio Guterres pushes for countries to increase their greenhouse gas reduction targets.<br />''<br />''The World Meteorological Organization in a compiled report said average global temperature between 2015-2019 is on track to be the hottest of any five-year period on record. The period is currently estimated to be 1.1 degrees Celsius above pre-industrial (1850-1900) times and 0.2 degrees Celsius warmer than 2011-2015.<br />''<br />''The past four years were already the hottest since record-keeping began in 1850.<br />