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A worker arranges dried rice next to a belt conveyor at a drying center of a farm on Nov. 2, 2021, in Susong County, Anhui Province, China. The 2021 Call for Code finalists focus on sustainability, climate change mitigation and other environmental issues, including in farming and food waste. (Li Long/VCG via Getty Images) At a Glance Solutions focus on clean water, recycling, food waste, sustainable shopping and community farming.Winners will be announced Nov. 16.The grand prize is $200,000. Five...