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CO2 removal can lower costs of climate protection
Date:4/12/2013

re include afforestation and chemical approaches like direct air capture of CO2 from the atmosphere or reactions of CO2 with minerals to form carbonates. But the use of biomass for energy generation combined with carbon capture and storage is less costly than chemical options, as long as sufficient biomass feedstock is available, the scientists point out.

Serious concerns about large-scale biomass use combined with CCS

"Of course, there are serious concerns about the sustainability of large-scale biomass use for energy," says co-author Ottmar Edenhofer, chief-economist of PIK. "We therefore considered the bioenergy with CCS option only as an example of the role that carbon dioxide removal could play for climate change mitigation." The exploitation of bioenergy can conflict with land-use for food production or ecosystem protection. To account for sustainability concerns, the study restricts the bioenergy production to a medium level, that may be realized mostly on abandoned agricultural land.

Still, global population growth and changing dietary habits, associated with an increased demand for land, as well as improvements of agricultural productivity, associated with a decreased demand for land, are important uncertainties here. Furthermore, CCS technology is not yet available for industrial-scale use and, due to environmental concerns, is controversial in countries like Germany. Yet in this study it is assumed that it will become available in the near future.

"CO2 removal from the atmosphere could enable humankind to keep the window of opportunity open for low-stabilization targets despite of a likely delay in international cooperation, but only under certain requirements," says Edenhofer. "The risks of scaling up bioenergy use need to be better understood, and safety concerns about CCS have to be thoroughly investigated. Still, carbon dioxide removal technologies are no science fiction and need to be further explored." In n
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Contact: Jonas Viering
press@pik-potsdam.de
49-331-288-2507
Potsdam Institute for Climate Impact Research (PIK)
Source:Eurekalert

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