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Readers respond to stories about climate change, shorter workweeks, and more.

EARTH CHANGING

Thank you for your article on David Keith and his advocacy for investing in research into geoengineering and how it might be used to mitigate climate change should it become necessary (“David Keith Hopes We Don’t Have to Use His Ideas to Reverse Global Warming,” October 20). This is an important conversation that we should be having in the United States even if some of us cringe at the thought of having to deploy geoengineering because a lack of political will brings us to that point.

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