Carbon dioxide removal (CDR) has become a focal point for policymakers who are pursuing strategies for climate change mitigation. Two types of CDR methods are proposed and subsidized by many countries; mechanical capture and biological sequestration. This study compares methods on the basis of three criteria: effectiveness at net carbon removal, efficiency at a climate-relevant scale, and beneficial and adverse co-impacts. The study says “Our findings indicate that biological methods have a superior return on resource inputs in comparison to mechanical methods. Biological methods are both more effective and more resource efficient in achieving a climate-relevant scale of CO2 removal. Additionally, the co-impacts of biological methods are largely positive, while those of mechanical methods are negative. Biological methods are also far less expensive. Despite their disadvantages and a track record of failure to date, mechanical CDR methods continue to receive large subsidies from the US government while biological sequestration methods do not.”

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Credits to Plos Climate
June Sekera ,Dominique Cagalanan,Amy Swan,Richard Birdsey,Neva Goodwin,Andreas Lichtenberger