Nature-Based vs Engineered Carbon Removals: What Is The Difference

Not all carbon removals work the same way. The voluntary carbon market offers two distinct approaches to physically extracting CO₂ from the atmosphere: nature-based removals, which work through ecosystems, and engineered removals, which use technology. Both generate removal credits, but they differ in cost, durability, and the role they play in a credible net-zero strategy.

What Are Nature-Based Carbon Removals?

Nature-based solutions (NBS) use ecosystems to capture and store atmospheric carbon. Forests absorb CO₂ through photosynthesis. Mangroves lock carbon into coastal soils. Grasslands and agricultural soils hold carbon in organic matter. Projects in this category include reforestation, afforestation, soil carbon enhancement, blue carbon (mangroves and seagrass), and agroforestry.

These projects tend to be lower cost and they deliver co-benefits beyond carbon: biodiversity, watershed protection, and livelihood support for local communities. Many are certified under established registries like Verra's Verified Carbon Standard or Gold Standard.

The primary limitation is permanence, as forests can burn, droughts degrade ecosystems, and land-use changes can reverse stored carbon. Buffer pools and insurance mechanisms exist to manage reversal risk, but nature-based removals are generally considered less durable than geological storage. The IPCC distinguishes geological storage as having greater permanence certainty than biological storage precisely because it doesn't carry the same non-permanence risks from disturbance events.

What Are Engineered Carbon Removals?

Engineered removals use technology to capture CO₂ and store it in ways that outlast biological systems. The main methods include CDR (carbon dioxide removal) approaches such as direct air capture (DAC), which uses chemical processes to pull CO₂ directly from ambient air; bioenergy with carbon capture and storage (BECCS), which combines biomass energy with underground CO₂ injection; and biochar, which converts organic material into a stable, carbon-rich substance that persists in soils for centuries. These projects also bring their own co-benefits, from local job creation to industrial development.

Storage in geological formations can hold carbon for thousands of years, making engineered removals attractive for buyers with strict permanence requirements. Biochar sits at the intersection of natural and technological approaches given its agricultural origins, and is more accessible than DAC at commercial scale.

How the Two Categories Work Together

Nature-based and engineered removals are not competing alternatives. They serve different roles in a portfolio approach to carbon management.

Nature-based solutions offer scale and co-benefits at accessible price points. Engineered removals, particularly those with geological storage, are increasingly prioritized by corporate buyers seeking to address residual emissions they cannot eliminate through operational changes alone. Microsoft, Stripe, and other high-profile buyers have made public commitments to high-durability engineered removals for precisely this reason. The SBTi's guidance on beyond-value-chain mitigation (actions companies can take beyond their own value chains to support global climate goals) is expected to further shape how organizations allocate across both categories as integrity standards tighten.

Key Takeaway

Nature-based and engineered removals each have a role in the carbon market. Nature-based solutions offer scale, cost-efficiency, and co-benefits available today. Engineered removals offer permanence and precision for high-integrity climate claims. Understanding the difference is essential for any buyer, developer, or investor building a credible carbon strategy. As demand for durability grows, the two approaches are becoming complementary rather than interchangeable.