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Science. 2006 Oct 20;314(5798):452-4. Epub 2006 Sep 14.

A combined mitigation/geoengineering approach to climate stabilization.

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  • 1National Center for Atmospheric Research, Post Office Box 3000, Boulder, CO 80307-3000, USA. wigley@ucar.edu

Abstract

Projected anthropogenic warming and increases in CO2 concentration present a twofold threat, both from climate changes and from CO2 directly through increasing the acidity of the oceans. Future climate change may be reduced through mitigation (reductions in greenhouse gas emissions) or through geoengineering. Most geoengineering approaches, however, do not address the problem of increasing ocean acidity. A combined mitigation/geoengineering strategy could remove this deficiency. Here we consider the deliberate injection of sulfate aerosol precursors into the stratosphere. This action could substantially offset future warming and provide additional time to reduce human dependence on fossil fuels and stabilize CO2 concentrations cost-effectively at an acceptable level.

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