Insetting vs Offsetting: What Coastal Insetting Could Mean

A seafood company wants to cut the carbon footprint of its supply chain. It could buy credits from a mangrove project on another continent — that's offsetting. Or it could pay to electrify its own cold-storage fleet, switch its packaging to kelp-based bioplastic, and fund restoration on the reefs its fishing fleet works over — that's insetting. The second approach is gaining serious traction in corporate climate strategy, and it has particular resonance in ocean industries, where the value chain and the ecosystem are often the same place. This explainer sets out the difference, why insetting is rising, and what coastal insetting could realistically look like.

Offsetting: The Established Tool

Offsetting means compensating for emissions occurring anywhere by funding reductions or removals elsewhere. A company in Glasgow buys verified credits from a seagrass restoration in Indonesia. The credits flow through the voluntary carbon market, governed by standards, registries and third-party auditors. Offsetting can be legitimate and powerful — some of the best-funded restoration on Earth happens because of it — but it faces persistent criticism:

• Distance — a company pollutes here, claims virtue there.
• Additionality — would that mangrove project have happened anyway? (We've written a whole explainer on additionality because it's the make-or-break question.)
• Permanence — will the carbon stay stored? (Buffer pools are the insurance mechanism.)
• Licence optics — offsetting can look like buying indulgences rather than changing practice.

The first three criticisms are technical problems with technical solutions. The fourth is political — and it's where insetting enters.

Insetting: Decarbonising From Within

Insetting is investing in emission reductions or removals within your own value chain — upstream with your suppliers, downstream with logistics and customers, or in the ecosystems your operations depend on. Instead of buying external credits, you fund change you can physically touch:

• A cocoa company paying shade-grown agroforestry premiums to its own farmers (the classic, land-based example)
• A fashion brand funding regenerative practice in its cotton-shed
• For the ocean: a shipping line investing in port-electricity infrastructure it itself uses; a food company funding kelp and shellfish growers that supply it with both ingredients and shoreline resilience

The appeal is strategic: insetting simultaneously decarbonises your supply chain, builds supplier resilience, and transports your climate story from "elsewhere" to "here, in our operations". It's also often easier to verify because you're embedded in the supply relationship.

The Accounting Tension: Who Gets to Claim What?

Here's where insetting gets tricky. With offsetting, the credit is a discrete, registry-tracked instrument: one tonne, one serial number, one retirement. With insetting, the reduction happens inside your Scope 3 inventory (your value chain's emissions). There's no credit. The benefit shows up as a smaller number in your own footprint report.

That creates two integrity questions:

Double counting between companies

If you fund regenerative aquaculture on a supplier's farm, and both of you report the reduction in your emissions, you've double counted. The fix is contractual: one party claims the reduction, the other claims the co-benefit. Standards bodies are formalising how this works. See our explainer on double counting for the broader mechanics.

Scope 3 attribution is genuinely hard

Measuring Scope 3 — the emissions embedded in everything you buy and sell — is notoriously imprecise. A fishing company insetting in refrigeration upgrades can't always get supplier-level data. This friction is real, and it's one reason offsetting persists: credits are, at least, countable.

Why Ocean Insetting Is Different — and Promising

Ocean industries have a property almost no other sector shares: their value chain is an ecosystem. A seafood company's supply chain literally is the kelp forest, the reef, the fishing ground. This blurs the offset/inset line in an interesting way:

• Restoration can be an inset. If a marine food company funds restoration on reefs its fishers work, the investment strengthens its own supply security (fish stocks, nurseries, storm buffering) while generating carbon and biodiversity outcomes. Is it offsetting (external credits) or insetting (value-chain resilience)? Both readings are defensible, though the accounting rules differ.
• Kelp products couple production with restoration. Buying kelp-based bioplastic or fertiliser inputs — the kinds of products we build at Tidewright Harvest — can reduce emissions in the buyer's supply chain and fund the restoration the kelp farm supports. This is insetting in its purest ocean form: procurement that does climate work.
• Port electrification, vessel efficiency and cold-chain upgrades in a company's own operations combine straightforwardly with nature investment in adjacent waters, creating a composite "coastal inset" that no land-sector equivalent can quite match.

For companies under pressure to show value-chain action (as opposed to spot-buying credits), coastal insetting offers a narrative that actually aligns with the science: invest where you operate, on the systems you depend on.

What a Credible Coastal Insetting Program Looks Like

If your company is considering coastal insetting, we'd suggest the following building blocks, in order:

1. Start with your own emissions. Insetting works best after you've squeezed your Scope 1 and 2 (direct and electricity emissions). Insetting is not a substitute for cutting your own fossil fuel use — it's what you do once that pathway is clear.
2. Map Scope 3 hotspots. Where in your supply chain does the carbon actually live? Cold chain? Packaging? Transport? Aquafeed? Those are the inset targets.
3. Identify your "ocean nexus". Where do your operations touch marine ecosystems — ports, fishing grounds, coastal facilities, aquaculture? Those ecosystems are candidate inset geographies: investable, visible, and materially relevant to your business.
4. Structure contracts that prevent double counting. Decide explicitly who reports what. Document it for auditors.
5. Pair nature investment with operational change. Funding kelp restoration while simultaneously upgrading your refrigeration fleet is more credible than either alone.
6. Choose projects you can visit. One advantage of insetting over distant offsetting is that stakeholders can see the work. Choose accordingly.

Insetting and Offsetting: Not Either/Or

Mature corporate climate strategies typically run both:

• Insetting for the value chain, building long-term decarbonisation and resilience where it pays back operationally
• Offsetting for residual emissions that cannot yet be eliminated, using high-integrity external credits (start with our buyer's guide to blue carbon credits)

Standards like the Science Based Targets initiative push companies hard on value-chain cuts first. Offsetting for what remains is accepted IF the credits are high quality. The insetting/offsetting lens fits into that hierarchy: cut, insetting for your chain, offset only for what's truly residual.

Where Tidewright Fits

Tidewright is, in some sense, a coastal-insetting vehicle: companies, councils and fisheries pay us to restore the ecosystems their operations depend on, through Reef Partners programs. A fisheries co-op funding kelp restoration on its own grounds is insetting. A carbon buyer purchasing Canopy Ledger–verified credits from our restoration sites is offsetting. Both fund the same reef; the difference is the buyer's accounting frame. We see demand for both — and we think the ocean sector's future runs on both, interleaved.

Key Takeaways

• Offsetting funds decarbonisation elsewhere via credits; insetting funds decarbonisation inside your own value chain.
• Ocean industries can inset in ways land industries can't: their supply chain is the ecosystem, so restoration adjacent to operations is both value-chain investment and nature investment.
• Insetting has no credit instrument — the benefit shows up as a lower Scope 3 inventory. Contracts must explicitly prevent double counting between partners.
• Kelp-based products are a uniquely pure inset: procurement that cuts emissions and funds restoration simultaneously.
• Mature climate strategies run insetting (value chain) and offsetting (residual emissions) in parallel; neither substitutes for cutting your own direct emissions first.

FAQ

Is insetting recognised by carbon standards?

Insetting isn't a formal credit class like offsetting, but its logic appears in SBTi guidance on value-chain decarbonisation and in emerging "Scope 3 intervention" frameworks. The science is accepted; the accounting conventions are still consolidating.

Can insetting projects also generate credits for someone else?

Generally not the same tonne. If your investment lowers your supplier's emissions and you claim that in your Scope 3 reporting, the supplier can't also sell those reductions as credits. Registry rules increasingly check for this. Clear contracting is the safeguard.

Is insetting always better than offsetting?

No — it depends on your emissions profile and goals. Insetting is powerful when your value chain has decarbonisable hotspots. For emissions you can only abate elsewhere, high-integrity offsetting remains necessary. Compare options honestly rather than defaulting to whichever sounds better.

What's a realistic first ocean inset for a small food company?

Start with a modest spend on a coastal restoration project adjacent to where you source (see our solutions for fisheries or for carbon buyers), paired with one operational change in your cold chain or packaging. Small, visible, local.

Who verifies insetting outcomes?

Your own auditors, under your sustainability reporting framework, plus — for nature outcomes — third-party verification of ecosystem condition. At Tidewright that verification is central to what Canopy Ledger produces for every project, inset or offset.