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    Home Science

    New NASA Data Shows Which Countries Emit, and Soak Up, the Most Carbon Dioxide

    By: Olivia Rosane
    Updated: March 14, 2023
    Edited by Chris McDermott
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    Smoke rises from the Marathon Anacortes Refinery in Anacortes, Washington
    The Marathon Anacortes Refinery in Anacortes, Washington on March 8, 2022. The U.S. is the second most CO2-emitting nation according to NASA satellite data. David Ryder / Getty Images
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    What countries emit the most net carbon dioxide? 

    Up until now, this question has been answered by calculating the emissions of each sector in a nation’s economy via a “bottom up” approach. However, a new paper published in Earth System Science Data March 7 pilots a “top down” approach by using NASA satellite data to calculate how much carbon dioxide more than 100 nations emit, and how much their natural carbon sinks suck back up again.

    “Our top-down estimates provide an independent estimate of these emissions and removals, so although they cannot replace the detailed process understanding of traditional bottom-up methods, we can check both approaches for consistency,” study co-author and Laboratoire des Sciences du Climat et de l’Environnement in France research director Philippe Ciais said in a NASA press release.

    NASA’s OCO-2 satellite helps track carbon dioxide emissions for more than 100 countries.

    In this map, countries where more carbon dioxide was removed than emitted appear as green depressions, while countries with higher emissions are tan or red and appear to pop off the page. pic.twitter.com/6w6Ij7nxCV

    — NASA Earth (@NASAEarth) March 7, 2023

    The commonly used “bottom up” method of carbon accounting is extremely useful but also demands expertise and accurate data, making it harder for nations with fewer resources. The “top down” method can therefore fill in the gaps, providing data for more than 50 countries that had not reported their emissions in the past decade. 

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    The paper, which was the work of more than 60 scholars from around the world, used carbon dioxide data from NASA’s Orbiting Carbon Observatory-2 (OCO-2) mission as well as ground level data. It covered the years between 2015 and 2020. 

    The satellite data revealed that the top emitting countries were, as The Weather Channel reported: 

    1. China
    2. The U.S.
    3. India
    4. Indonesia
    5. Malaysia
    6. Brazil
    7. Mexico
    8. Iran
    9. Japan
    10. Germany

    Other high emitters were the UK, the rest of the western EU, Australia, Kazakhstan, much of North Africa, South Africa, Chile, Thailand and the Philippines. In the Global South, deforestation was a major driver of emissions, according to NASA. 

    Overall, the findings are similar to other lists of top emitting countries, with China, the U.S. and India leading the way in Climate Watch’s data set. However, Russia, Canada and Saudi Arabia were on the top ten according to Climate Watch but not according to the satellite data, with Canada and Russia emerging as net carbon dioxide sponges. This is likely because national emissions data typically only includes greenhouse gas emissions and removals from managed land, while the satellite data accounts for unmanaged land as well, the study authors noted.

    The research comes at a key time for nations seeking to calculate their emissions and plan their reductions. That’s because 2023 marks the first global stocktake, in which signatories of the Paris agreement must evaluate their progress towards limiting global warming to well below two degrees Celsius above pre-industrial levels. The study is one example of how data from space can help improve life on Earth.

    “NASA is focused on delivering Earth science data that addresses real-world climate challenges – like helping governments around the world measure the impact of their carbon mitigation efforts,” NASA’s Earth Science Division at NASA Headquarters in Washington Director Karen St. Germain said in the press release. “This is one example of how NASA is developing and enhancing efforts to measure carbon emissions in a way that meets user needs.”

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      Olivia Rosane

      Olivia Rosane is a freelance writer and reporter with a decade’s worth of experience. She has been contributing to EcoWatch daily since 2018 and has also covered environmental themes for Treehugger, The Trouble, YES! Magazine and Real Life. She holds a Ph.D. in English Literature from the University of Cambridge and a master’s in Art and Politics from Goldsmiths, University of London.
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