Meanwhile, large swathes of Siberia have seen a prolonged and remarkable heatwave during the first half of 2020, which would have been very unlikely without anthropogenic climate change. WMO Greenhouse Gas Bulletin #16, November 23, 2020:. However, the WMO described the projected 2020 drop as a "tiny blip" and said the resulting impact on the carbon dioxide concentrations that contribute to global warming would be no bigger than normal annual fluctuations. “Greenhouse gas concentrations - which are already at their highest levels in 3 million years - have continued to rise. In 2019, the concentration of carbon dioxide — the most abundant greenhouse gas — in the atmosphere passed levels not seen for millions of years, and has continued to rise throughout 2020. Greenhouse gas concentrations rose again this year despite the world’s COVID-19 lockdowns, says the World Meteorological Organisation. During the most intense period of forced confinement in early 2020, daily global CO2 emissions may have been reduced by up to 17% compared to the mean level of daily CO2 emissions in 2019. Natural sources of carbon monoxide include lighting, volcanoes, and smoke from wildfires. The graph, updated daily, shows as individual points daily and hourly mean CO 2 for the last 31 days. Daily average CO 2 values are computed from selected hourly values that satisfy 'background' conditions, i.e. Concentrations of nitrous oxide, the third major greenhouse which is gas caused largely by agricultural fertilisers, meanwhile stood at 332 ppb last year, or 123 percent over pre-industrial levels. Last Updated: 23rd November, 2020 19:15 IST COVID-19 Has Had No Impact On Greenhouse Gas Levels That Drive Climate Change, Says WMO As per the World Meteorological Organization, the novel coronavirus has had no significant impact on the concentrations … READ MORE: Greenhouse gases surge to record in 2018, exceeding 10-year average - UN. stability and persistence of CO 2 concentrations (read below for … Global data is not yet available for 2020 … Its rise from 2018 to 2019 was also lower than the observed from 2017 to 2018, but en par with the average annual growth rate over the past decade. News UN: Greenhouse gas levels hit record high despite lockdowns. Hourly (red circles) and Daily (yellow circles) averaged CO 2 values from Mauna Loa, Hawaii for the last 31 days.. Carbon monoxide is a colorless, odorless air pollutant with the chemical formula CO. High concentrations of this gas can prove deadly.