Carbon offsets primer

This briefing by Zero Carbon Analytics examines the systemic failures of carbon offsetting, arguing that these mechanisms often increase global emissions rather than reduce them. The document details how both compliance and voluntary carbon markets suffer from low environmental integrity, lack of additionality, and fraudulent practices, particularly in forestry projects. It concludes that carbon offsets are not a valid climate solution and that priority must be given to direct emission mitigation over offsetting or unproven large-scale carbon removal technologies.

• Carbon offsetting often fails to deliver real emission reductions and can lead to an overall increase in global emissions. A 2024 systematic review in Nature found that less than 16% of investigated carbon credits represented real reductions, while the remaining 84% resulted in the release of 812 million tonnes of emissions, which is more than Germany's annual CO2 emissions.
• The environmental integrity of carbon offsets is frequently compromised by a lack of 'additionality,' meaning projects would have occurred even without carbon credit revenue. For example, a review of 1,350 wind farms in India indicated that 52% would have been built regardless of income from Clean Development Mechanism (CDM) credits.
• Forestry offsets are particularly prone to overstatement and fraud. An investigation into the certifier Verra found that the threat of deforestation was overstated by an average of 400%, leading to more than 90% of its forest offsets not representing genuine carbon reductions.
• Nature-based offsets are fundamentally flawed because they assume carbon fungibility, ignoring that carbon stored in nature is not permanent and carries a higher risk of leaking back into the atmosphere compared to fossil fuels left in the ground.
• The Voluntary Carbon Market (VCM) is characterized by an oversupply of low-quality 'junk' credits, which suppresses prices. As of February 2025, VCM offsets were priced between USD 1-10, significantly lower than the USD 40-100 range suggested by the High-Level Commission on Carbon Prices for 2020-2030.
• Carbon offset projects have been linked to human rights abuses, land conflicts, and fraud, creating significant reputational and litigation risks for companies. In 2023, a German court ruled that Eurowings' claims of climate neutrality based on offsets were misleading.
• While the IPCC notes a theoretical need for durable carbon removals for residual emissions, these technologies are currently unproven at scale, expensive, and cannot be relied upon to meet climate targets.

APA

Team, Z. (2025). Carbon offsets primer. Zero Carbon Analytics. https://zerocarbon-analytics.org/insights/briefings/carbon-offsets-primer-2/

Chicago

Team, ZCA. Carbon offsets primer. Zero Carbon Analytics, 2025. https://zerocarbon-analytics.org/insights/briefings/carbon-offsets-primer-2/.

Wikipedia

{{cite report |last1=Team |first1=ZCA |title=Carbon offsets primer |publisher=Zero Carbon Analytics |date=26 February 2025 |url=https://zerocarbon-analytics.org/insights/briefings/carbon-offsets-primer-2/ |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{team2025carbon, author = {Team, ZCA}, title = {{Carbon offsets primer}}, institution = {Zero Carbon Analytics}, year = {2025}, month = feb, url = {https://zerocarbon-analytics.org/insights/briefings/carbon-offsets-primer-2/}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }