A 2016 EU study found 85% of carbon offset projects analysed likely overestimated the emission reductions they generated.
Notes:
Primary Source:
2016 - https://ec.europa.eu/clima/sites/clima/files/ets/docs/clean_dev_mechanism_en.pdf
2016 - https://ec.europa.eu/clima/sites/clima/files/ets/docs/clean_dev_mechanism_en.pdf