My honest reaction to that misinformation:
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The cultivation of rice in classical southern China was extraordinarily labor intensive, requiring a constant whole-of-society effort to ensure that the irrigation system and the strict schedule of harvest and planting functioned without a hitch. It was not remotely a gift of nature. This is well described by the exerpt below in
civilization and capitalism, fifteenth–eighteenth century, vol. 1 the structure of everyday life
(ignore the obvious racist stuff the quotes are from 1730)
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