Food production significantly impacts climate change, accounting for about a quarter of global greenhouse gas emissions. While most foods release carbon dioxide (CO2) into the atmosphere, some foods, known as “carbon negative,” actually absorb more greenhouse gases than they emit, aiding in climate change mitigation and ecosystem restoration.
Key Carbon Negative Foods
Kelp and Macroalgae: These plants take in CO2 as they grow, with some of the carbon being stored in the ocean floor. Locally sourced kelp can be carbon negative, particularly when it supports the restoration of kelp forests.
Bacterial Products: Methane-oxidizing bacteria consume methane, a potent greenhouse gas, and convert it into CO2, which is less harmful. Foods derived from these bacteria could potentially be carbon negative, although such products are not yet available on the market.
Blueberries and Celery: When cultivated on wetted peatlands, these foods can be carbon negative, as organic carbon accumulates more quickly than it decomposes. However, their high-carbon supply chains, including plastic packaging and air travel, often negate their potential benefits.
Nuts, Olives, and Citrus: Growing trees for crops like nuts helps sequester carbon. Over a span of 20 years, these trees absorb more CO2 than is released during their production, making tree crops carbon negative throughout their lifespan.
Regeneratively Farmed Food: Certain farming methods that avoid tilling and incorporate hedgerows can enhance the amount of carbon stored in soil. However, regenerative practices may not be effective for high-emission foods like beef.
Challenges and Future Solutions
Carbon-negative foods remain uncommon and difficult to identify, but new carbon labeling systems emerging in places like New Zealand and France will assist consumers in making informed choices.
Land-sparing strategies could also be vital. By boosting yields from existing farmland, we can free up land for reforestation, which would help absorb more carbon. This approach is particularly effective when replacing land-intensive products like beef with plant-based alternatives.
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