Nobel laureate Paul Crutzen proposes a possible escape route from nearly out-of-control global warming. He explores the possibility of releasing light-reflecting sulfur particles into the upper atmosphere, which would redirect heat back into space, cooling the global climate.

Example of proposed geoengineering techniques to limit the effect and impact of climate change due to rising levels of greenhouse gases include the production of stratospheric sulfur aerosols, which was suggested by Paul Crutzen.

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