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Perovskite solar cells are an emerging energy technology but their sustainability is jeopardized by the presence of Pb. Here the authors introduce on-device layers that could capture over 99.9% of leaked Pb.
Not all meat sources have equal climate and environmental impacts, leading to hopes that fish and chicken could ‘displace’ red meat. However, this analysis of five decades of international data casts doubt that such a substitution effect is happening, and that instead all meat consumption is rising.
