Petteri Taalas (1st L, Rear), Secretary-General of World Meteorological Organization (WMO), speaks at the news conference for the launch of an annual WMO report, at the UN headquarters in New York, on March 28, 2019. The WMO Statement on the State of the Global Climate 2018 states that 2018 was the fourth warmest year on record and that 2015-2018 were the four warmest years on record. (Xinhua/Li Muzi)