Atmospheric carbon dioxide levels reached 420 parts per million in 2023, the highest in the last 8,00,000 years, according to the World Meteorological Organization's (WMO) State of the Climate report published on Wednesday. The report said long-term global warming is currently estimated to be between 1.34 and 1.41 degrees Celsius compared to the 1850-1900 baseline. It said that tropical cyclones, floods, droughts and other disasters in 2024 led to the highest number of new displacements recorded in the past 16 years. These events also worsened food crises and caused massive economic losses. Carbon dioxide levels in 2023 (the latest year with complete global data) were 420.0 0.1 parts per million (ppm), 2.3 ppm higher than in 2022 and 151 per cent of the pre-industrial level (1750). The WMO said 420 ppm corresponds to 3,276 gigatonnes (or 3.276 trillion tonnes) of carbon dioxide in the atmosphere. The report said the past 10 years (2015-2024) were the warmest on record, with each o