1. Global Status Report – Global CCS Institute https://www.globalccsinstitute.com/resources/global-status-report/ (accessed 2021-03-16)
2. Summary for Policymakers – Global Warming of 1.5 °C, https://www.ipcc.ch/sr15/chapter/spm/ (accessed 2022-08-06)
3. N.Nakicenovic , J.Alcamo , G.Davis , B. D.Vries , J.Fenhann , S.Gaffin , K.Gregory , A.Grübler , T. Y.Jung , T.Kram , E. L. L.Rovere , L.Michaelis , S.Mori , T.Morita , W.Pepper , H.Pitcher , L.Price , K.Riahi , A.Roehrl , H.-H.Rogner , A.Sankovski , M.Schlesinger , P.Shukla , S.Smith , R.Swart , S. V.Rooijen , N.Victor and Z.Dadi , Special Report on Emissions Scenarios − Summary for Policymakers , Intergovernmental Panel on Climate Change , 2000
4. Sources of Greenhouse Gas Emissions US EPA, https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emissions (accessed 2022-10-21)
5. Air as the renewable carbon source of the future: an overview of CO2 capture from the atmosphere