carbonplan

@carbonplanorg

Data and science for climate action.

San Francisco, CA
Joined November 2019

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  1. Pinned Tweet
    Apr 29

    We are excited to release a major new study led by the remarkable forest ecologist documenting widespread over-crediting in California’s forest carbon offsets program. (1/20)

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  2. 18 hours ago

    As the is live and growing fast, we’ll continue to update this thread as more information becomes available. Meanwhile, we’ll be thinking of the firefighters and communities affected by evacuations and smoke. (10/10)

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  3. 18 hours ago

    Those looking to support local communities affected by the fire can donate to the nearby Klamath Food Bank or Red Cross Oregon. (9/10)

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  4. 18 hours ago

    Major fires aren’t just a problem for local and downwind communities. As wrote for the , the also caused major disruptions on the regional electricity grid. (8/10)

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  5. 18 hours ago

    Unfortunately, the risk of forest fires will only get worse with climate change. In recent work with we projected escalating future risks to western forests. Here’s the regional projection under different emissions scenarios. (7/10)

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  6. 18 hours ago

    But as and wrote for , even last year’s large fire raised questions about the adequacy of carbon offset buffer pools. (6/10)

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  7. 18 hours ago

    Together with , we wrote about the likely impacts from that fire and its implications for California’s forest carbon “buffer pool” — an insurance-like mechanism that sets aside a share of each project’s credits in case of disaster. (5/10)

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  8. 18 hours ago

    This isn’t the first time fire has hit a large forest offset project. Last year spotted another Oregon fire burning a forest credited in California’s offsets program. Here’s her eagle-eyed thread from Sept. 2020. (4/10)

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  9. 18 hours ago

    The project impacted by the , ACR273, is a 400,000 acre forest project that was recently harvested for timber and has earned more than 950,000 offset credits from California’s climate regulator as it regrows. (3/10)

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  10. 18 hours ago

    The is currently at 201,923 acres and growing, approximately 11 miles northeast of the town of Sprague River, Oregon. (2/10)

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  11. 18 hours ago

    As the burns out of control in Oregon — with critical implications for public safety, air quality, and forest health — we can report that another large forest offset project appears to be on fire. (1/10)

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  12. Retweeted
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  13. Jun 17

    Thanks to for leading this analysis; to coauthors ; to and Dan Liptzin for helpful discussions; and to for funding. (9/9)

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  14. Jun 17

    But as federal lawmakers, state regulators, and voluntary carbon markets all explore crediting soil carbon, we need to be extremely careful to get the measurement right — otherwise we risk making big mistakes. (8/9)

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  15. Jun 17

    It’s important to remember that even if the carbon benefits from agricultural practices are uncertain or overestimated, they can still be broadly beneficial for maintaining soil health and ecosystem services. (7/9)

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  16. Jun 17

    We used a simple calculation to illustrate the potential consequences of ignoring these issues. At the scale of the entire US, measurement artifacts could over-credit 367 million tCO₂, equivalent to 58% of the total annual emissions from the US agricultural sector in 2019. (6/9)

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  17. Jun 17

    We also looked at how changes in soil density in the top layer, which occur after conversion to no-till, can appear as changes to soil carbon unless careful estimation methods are used. Luckily, this potential measurement artifact can be corrected! (5/9)

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  18. Jun 17

    Carbon redistribution means that conversion to no-till can increase carbon in the top layer of soil while decreasing it at greater depths. Carbon accounting must look at the complete depth profile, otherwise we might get the wrong answer. (4/9)

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  19. Jun 17

    Our article discusses two issues that can be major pitfalls when measuring soil carbon: carbon redistribution and density changes. We use conversion from tillage to no-till as our example. (3/9)

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  20. Jun 17

    Soil carbon sequestration has been getting a lot of attention as a climate mitigation strategy, but actually measuring soil carbon is super complicated. For any of these efforts to succeed, we need rigorous and robust measurement. (2/9)

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  21. Jun 17

    New article announcement! Our collaborator led an analysis with us on the role of depth in soil sampling, and why it matters for soil carbon crediting. (1/9)

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