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Table 4 Categories of geoengineering proposals, based on IPCC ( [2013] )

From: Modeling in Earth system science up to and beyond IPCC AR5

Category Proposal
CDR Afforestation and reforestation
  Bioenergy with carbon capture and storage (BECCS)
  Biochar creation and storage in soils
  Ocean fertilization by adding nutrients to surface waters
  Ocean-enhanced upwelling, bringing more nutrients to surface waters
  Land-based increased weathering
  Ocean-based increased weathering
  Direct air capture (engineering method)
SRM Space-based methods
Stratospheric aerosol injection
Cloud brightening
Surface albedo changes