Answer : 4. "WMO"
Explanation :

Solution: According to the 19th Annual Greenhouse Gas Bulletin, greenhouse gas concentrations in the atmosphere reached unprecedented levels in 2022, and there is no sign of this increasing trend stopping. The World Meteorological Organization (WMO), a branch of the United Nations, has reported that last year, levels of carbon dioxide, methane and nitrous oxide, the three primary greenhouse gases responsible for climate warming, reached record-breaking levels. ,