How did we deal with past climate change events? Researchers are trying to find out

The Machu Picchu archeological site is devoid of tourists while it's closed amid the COVID-19 pandemic, in the department of Cusco, Peru, Tuesday, Oct. 27, 2020. (AP Photo/Martin Mejia) The Machu Picchu archeological site is devoid of tourists while it's closed amid the COVID-19 pandemic, in the department of Cusco, Peru, Tuesday, Oct. 27, 2020. (AP Photo/Martin Mejia)

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