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A sign of the hearth with a word bubble saying "Help" is held at a rally
A crowd of people gather near a large poster that shows a speach bubble from planet Earth that reads ‘Help!!’, on the occaision of the first Earth Day conservation awareness celebration, New York, New York, April 22, 1970. (Phoro by Hulton Archive/Getty Images)
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Looking at necessities of a livable Earth — including the climate, freshwater systems, biodiversity and soil nutrients — the researchers find almost all have crossed crucial thresholds.

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