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Through the mid 1900s, amateur ornithologist and nature writer Louise de Kiriline Lawrence tracked the sharp decline in warblers and flycatchers in northern Ontario and linked it to the roadside spraying of toxic chemicals—a decade before Rachel Carson’s Silent Spring sounded the same alarm. Louise emigrated to Canada in 1926, setting up a Red Cross Outpost in Bonfield, Ontario, where she later became nurse-in-charge of the ...