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Soil carbon sequestration and biochar as negative emission technologies.

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Area of Science:

  • Environmental Science
  • Climate Science
  • Soil Science

Background:

  • Global greenhouse gas (GHG) emissions increased in the 2000s, challenging the 2°C warming limit.
  • Integrated assessment models (IAMs) often rely on negative emissions technologies (NETs) to meet climate targets.
  • Existing NETs face limitations in cost, energy, land, and water use.

Purpose of the Study:

  • To assess the negative emissions potential of soil carbon sequestration (SCS) and biochar.
  • To evaluate the global impacts of SCS and biochar on land, water, nutrients, albedo, energy, and cost.
  • To compare SCS and biochar with other NETs.

Main Methods:

  • Analysis of negative emission potential from soil carbon sequestration.
  • Assessment of biochar addition to land for carbon sequestration.
  • Evaluation of global impacts on land use, water, nutrients, albedo, energy, and cost.

Main Results:

  • SCS and biochar each offer a negative emission potential of 0.7 GtCeq. yr(-1).
  • These methods show potentially lower impacts on land, water, nutrients, energy, and cost compared to other NETs.
  • Limitations for SCS include sink saturation and reversibility; biochar can complement bioenergy with carbon capture and storage.

Conclusions:

  • SCS and biochar present viable NETs with fewer disadvantages than many alternatives.
  • Current IAMs lack representation of SCS and biochar, hindering further exploration.
  • Integrating SCS and biochar into IAMs is crucial for evaluating their role in climate stabilization.