Emissions of nitrous oxide, the third most important human-made greenhouse gas, rose 40 percent from 1980 to 2020, according to a new report by the, finds nitrous oxide is accumulating in Earth’s atmosphere faster than at any other time in human history and its current growth rate is likely unprecedented in the last 800,000 years. 0 is a long-lived, potent greenhouse gas that has been accumulating in the atmosphere since the pre-industrial era.
This graph shows the dramatic increase in atmospheric nitrous oxide concentrations over the past 2,000 years. Nitrous oxide concentrations were relatively stable at around 270 parts per billion until 1750. Credit: Global Carbon Project0 concentrations remained relatively constant at about 270 parts per billion over the past 2,000 years, but concentrations began going up around 1750.
GML researchers systematically measure and analyze concentrations of heat-trapping gases in air samples collected from around the globe.
An overview of how nitrous oxide concentrations have changed globally and by region from 1980 to 2020. Credit: Global Carbon Project0 emissions are accelerating faster than at any other time in human history and have surpassed even the most pessimistic greenhouse gas projections used by the IPCC.0 emissions come from natural sources, like soils and the ocean, over which humans have no control.
An overview of the main sources and sinks of atmospheric nitrous oxide from 2010 to 2019. Credit: Global Carbon Project
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