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Greenhouse Gas Removal: Proposed
Techniques to Remove Greenhouse
Gases from Ambient Air
Tim Kruger
Oxford Geoengineering P...
Climate Change
Ocean Acidification
What is geoengineering?
• The deliberate large-scale intervention in the
Earth’s natural systems to address climate
change
Some proposed
geoengineering techniques
Prevention is better than a cure…
• “The safest and most predictable method of
moderating climate change is to take early
...
… but if we can’t prevent it,
we sure need a cure
Source: “How difficultis it to recover from dangerouslevels of globalwar...
The scale of the challenge
Do we have a reverse gear?
“Global greenhouse gas emissions need to peak this
decade, and get to zero net emissions by the...
Proposed GGR techniques
Implications of GGR for CCS
• Some (but not all) GGR techniques
assume geological storage capacity 
potentially massively...
Alternative storage processes
• In situ carbonation of peridotite
• Carbon stored in biomass
• Carbon stored in biochar
• ...
Carbon-negative power
NaturalGas Air Limestone
Pure CO2 Electricity Lime
Geologicallysequestered Limestone
AbsorbsCO2 from...
Atmosphere Restoration Centre
Thank You
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Greenhouse Gas Removal: Proposed Techniques to Remove Greenhouse Gases from Ambient Air - Dr Tim Kruger at the UKCCSRC Direct Air Capture/Negative Emissions Workshop, 18 March 2014

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Presentation given by Dr Tim Kruger from the University of Oxford on "Greenhouse Gas Removal: Proposed Techniques" at the UKCCSRC Direct Air Capture/Negative Emissions Workshop held in London on 18 March 2014

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Greenhouse Gas Removal: Proposed Techniques to Remove Greenhouse Gases from Ambient Air - Dr Tim Kruger at the UKCCSRC Direct Air Capture/Negative Emissions Workshop, 18 March 2014

  1. 1. Greenhouse Gas Removal: Proposed Techniques to Remove Greenhouse Gases from Ambient Air Tim Kruger Oxford Geoengineering Programme Oxford Martin School University of Oxford 18 March 2014
  2. 2. Climate Change
  3. 3. Ocean Acidification
  4. 4. What is geoengineering? • The deliberate large-scale intervention in the Earth’s natural systems to address climate change
  5. 5. Some proposed geoengineering techniques
  6. 6. Prevention is better than a cure… • “The safest and most predictable method of moderating climate change is to take early and effective action to reduce emissions of greenhouse gases” (“Geoengineeringthe Climate: Science, Governance and Uncertainty” Royal Society, 2009)
  7. 7. … but if we can’t prevent it, we sure need a cure Source: “How difficultis it to recover from dangerouslevels of globalwarming?” J A Lowe, C Huntingford, S R B Raper, C D Jones, S K Liddicoat and L K Gohar Environ. Res. Lett. 4 (2009) 014012
  8. 8. The scale of the challenge
  9. 9. Do we have a reverse gear? “Global greenhouse gas emissions need to peak this decade, and get to zero net emissions by the second half of this century” Christiana Figueres (Executive Secretary of UNFCCC, 8 November 2013)) But as is made clear in the UNEP Emissions Gap Report (2012) “To achieve such negative emissions is simple in analytical models but in real life implies a need to apply new and often unproven technologies or technology combinations at significant scale”
  10. 10. Proposed GGR techniques
  11. 11. Implications of GGR for CCS • Some (but not all) GGR techniques assume geological storage capacity  potentially massively increased demand for storage sites • GGR storage sites do not need to be proximately located to emissions from point sources
  12. 12. Alternative storage processes • In situ carbonation of peridotite • Carbon stored in biomass • Carbon stored in biochar • Liquid CO2 stored on the ocean seabed • Dissolved Inorganic Carbon stored in the oceans
  13. 13. Carbon-negative power NaturalGas Air Limestone Pure CO2 Electricity Lime Geologicallysequestered Limestone AbsorbsCO2 from ambientair
  14. 14. Atmosphere Restoration Centre
  15. 15. Thank You

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