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Climate engineering is generally defined as the deliberate modification of large-scale Earth systems in order to change the climate. The most widely discussed form of climate engineering is the injection of particles into the stratosphere to block sunlight and cool the Earth. Increasingly, scientists and policymakers are seriously considering the use of climate engineering techniques to cool the Earth and offset the warming impact of rising atmospheric greenhouse gas concentrations. This talk discusses the dangers posed by climate engineering and argues that it should be subject to an international governance regime rather than being controlled exclusively by national governments. More information on the Iowa City Foreign Relations Council can be found here.