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Marginal Cost of Carbon Sequestration Using Straw-Based Biochar in Great Britain.

Yuzhou Tang1, Paul Wilson2, Tim T Cockerill1

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Straw-based biochar production in Great Britain offers a viable greenhouse gas removal (GGR) pathway, potentially meeting 0.6-1.9% of UK 2050 targets cost-effectively. This method addresses net-zero goals by utilizing abundant agricultural residue.

Keywords:
biochar productioncarbon sequestrationmarginal costscalabilityspatial analysisstraw

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Area of Science:

  • Environmental Science
  • Agricultural Science
  • Climate Change Mitigation

Background:

  • The UK's net-zero target necessitates significant greenhouse gas removal (GGR) alongside emission reductions.
  • Biochar, produced via biomass pyrolysis, is a recognized GGR technology.
  • Straw is an abundant UK feedstock for biochar, but feasibility requires cost and spatial analysis.

Purpose of the Study:

  • To estimate the marginal cost curve for net carbon sequestration using straw-based biochar in Great Britain.
  • To assess the potential contribution of straw biochar to the UK's 2050 carbon removal targets.
  • To identify key factors influencing the cost and scalability of straw biochar production.

Main Methods:

  • Integrated spatial modeling combined with life cycle assessment (LCA) and technoeconomic analysis (TEA).
  • Estimation of marginal costs for net carbon sequestration across Great Britain.
  • Analysis of feedstock availability, byproduct values, and biochar yield impacts.

Main Results:

  • Straw biochar production can achieve 0.6-1.9% of the UK's 2050 carbon removal target at marginal costs under £75 per tCO2e.
  • Including higher-cost options increases potential removal to 0.8-2.1%.
  • Marginal costs are sensitive to feedstock price, byproduct value, and biochar yield.

Conclusions:

  • Straw-based biochar presents a scalable GGR solution for the UK, contributing to climate change mitigation.
  • Optimized feedstock sourcing and production strategies are crucial for cost reduction and uncertainty management.
  • The study highlights challenges and limitations for large-scale straw biochar deployment in Great Britain.