The excellent People and Nature blog has recently published a really useful addition to the debate in the form of a review of a paper on Carbon Capture and Storage by June Sekera, a public policy analyst, and Andreas Lichtenberger, an ecological economist.
Here are some headlines from the report:
Carbon dioxide removal (CDR) systems, touted as techno-fixes for global warming, usually put more greenhouse gases into the air than they take out.
Carbon capture and storage (CCS), which grabs carbon dioxide (CO2) produced by coal- or gas-fired power stations, and then uses it for enhanced oil recovery (EOR), emits between 1.4 and 4.7 tonnes of the gas for each tonne removed.
Direct air capture (DAC), which sucks CO2 from the atmosphere, emits 1.4-3.5 tonnes for each tonne it recovers, mostly from fossil fuels used to power the handful of existing projects.
And if Carbon Capture were to be used at large scale things get much worse.
To capture 1 gigatonne of CO2 (1 GtCO2, just one-fortieth of current global CO2 emissions) would need nearly twice the amount of wind and solar electricity now produced globally. The equipment would need a land area bigger than the island of Sri Lanka and a vast network of pipelines and underground storage facilities.
We strongly recommend reading the full review.
The original paper – “Assessing Carbon Capture: public policy, science and societal need”, by June Sekera, a public policy analyst, and Andreas Lichtenberger, an ecological economics researcher – is free to download on the Biophysical Economics and Sustainability web site.