The Lockes have tilled the rich soil along the Mokelumne River since 1850. Now Chris Locke, 57, looks forward to passing down his orchards of 40,000 walnut trees to his four sons.
But the threat of global warming has him worried. “I talk to my boys about climate change,” he said. When he was young, frigid fogs rolled off the delta into Lockeford, the town named for his forebears. “We would go a week without seeing the sun. But we don’t seem to get that weather anymore…”

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