CARBON TAKE-BACK OBLIGATION

A carbon take-back obligation makes companies that extract or import fossil fuels responsible for permanently storing a rising share of the CO₂ produced when those fuels are used. A country would apply it to domestic producers and to importers bringing fuel into its market, so imported fuel does not escape the duty. The company can arrange storage itself or pay another operator and must provide verified evidence of the tonnes stored. This adds the cost of dealing with the fuel's CO₂ to supplying the fuel. Early compliance may use CO₂ captured from industrial exhausts. To guarantee demand for CDR, the rules must require some of the stored CO₂ to come from the atmosphere, directly or through biomass.

Authorities must decide which fossil fuels are covered and where responsibility is assigned when fuel is extracted, imported, processed and resold. Domestic production and imports need consistent treatment, with rules for exports and fuels used as materials rather than burned. The same fuel should not incur the duty several times as it moves between firms. Reported fuel quantities should be converted into the CO₂ they generate and matched with verified storage. Companies need not recover the identical CO₂ molecules released by their customers. Rules must distinguish fossil-source capture from atmospheric removal, define storage and leakage responsibility, and set a rising schedule alongside declining fossil-fuel use.

Placing responsibility upstream can reach emissions from millions of final users through a smaller group of producers and importers. A published rising schedule gives those firms a reason to secure long-term storage contracts and invest in capture, transport and storage. Early fossil-source capture can establish infrastructure later used by atmospheric removal. An explicit removal component can then create demand for CDR even where direct capture from dispersed users is impractical. Suppliers retain flexibility to develop projects themselves or purchase compliant storage services.

Early compliance may rely almost entirely on fossil-source capture, avoiding emissions without removing atmospheric CO₂. The obligation could be presented as permission for continued extraction, delay demand reduction or direct investment mainly towards fossil facilities. Suppliers may pass costs to consumers. Gaps in the treatment of imports, exports or resales can let firms avoid the duty or face it twice. Weak certificates, delayed infrastructure, lobbying over the schedule or unclear long-term liability could produce apparent compliance without secure storage.

Effective evaluation would compare fossil carbon sold with certificates cancelled, separating atmospheric, biogenic and fossil CO₂. Storage delivery, leakage, certificate prices, fuel demand, imports and consumer effects reveal whether the schedule works. Persistent reliance on avoided emissions, infrastructure delays or trade leakage should inform future coverage, required shares and enforcement.

Engagement should combine cost and capacity evidence from fuel suppliers, importers, storage operators and CDR developers with independent scrutiny of source accounting and permanence. Evidence from workers, consumers and communities near pipelines or storage sites should shape transition support, affordability protections, safety rules and long-term liability.

Supranational institutions can impose common product and market-access rules across member countries, reducing opportunities to reroute fossil supply. National governments can regulate domestic producers and importers, recognise storage certificates and enforce penalties at the border or point of sale. Regional and state governments can act where they control extraction licences, fuel distribution or environmental regulation, although national trade rules may constrain imported fuels. Coordination widens coverage and improves certificate compatibility.