Geosci. Model Dev., 11, 1–29, 2018 https://doi.org/10.5194/gmd-11-1-2018 © Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License. The Carbon Dioxide Removal Model Intercomparison Project (CDR-MIP): rationale and experimental design David P. Keller1, Andrew Lenton2,3, Vivian Scott4, Naomi E. Vaughan5, Nico Bauer6, Duoying Ji7, Chris D. Jones8, Ben Kravitz9, Helene Muri10, and Kirsten Zickfeld11 1GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany TS1 2CSIRO Oceans and Atmospheres, Hobart, Australia 3Antarctic Climate and Ecosystems Cooperative Research Centre, Hobart, Australia 4School of GeoSciences, University of Edinburgh, Edinburgh, UK TS2 5Tyndall Centre for Climate Change Research, School of Environmental Sciences, University of East Anglia, Norwich, UK 6Potsdam Institute for Climate Impact Research, Research Domain Sustainable Solutions, 14473 Potsdam, Germany 7College of Global Change and Earth System Science, Beijing Normal University, Beijing, China 8Met Office Hadley Centre, Exeter, UK 9Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA, USA 10Department of Geosciences, University of Oslo, Oslo, Norway 11Department of Geography, Simon Fraser University, Burnaby, Canada Correspondence: David P. Keller (
[email protected]) Received: 11 July 2017 – Discussion started: 17 August 2017 Revised: 7 December 2017 – Accepted: 19 December 2017 – Published: Abstract. TS3 TS4 CE1 The recent IPCC reports state that con- versibility”, the response of the Earth system to direct atmo- tinued anthropogenic greenhouse gas emissions are changing spheric CO2 removal (direct air capture and storage), and the the climate, threatening “severe, pervasive and irreversible” CDR potential and impacts of afforestation and reforestation, 25 impacts.