Despite extensive efforts, greenhouse gases continue to be emitted in vast amounts, with potentially devastating consequences around the world. This is why targeted interventions in the climate system, known collectively as 'climate engineering', are receiving increased attention. Proposed approaches are often divided into two groups: those intended to remove carbon dioxide from the atmosphere and those intended to reduce the amount of solar energy that reaches the Earth's surface or is trapped

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... in the atmosphere. There are some similarities between the two classes of activities, but they often raise different physical, political, and governance concerns. This series provides an introduction to each set of approaches.