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  • Bastou (edited 8 years ago)
    +7

    Fresh water supplies.

    And fewer and fewer farmers producing always less varied fruits and vegetables. Monocultures make the soil become weaker because it's always the same elements that gets consumed and rejected by plants, wich requires always bigger amounts of fertilizers and renders them much more vulnerable to illnesses that can harm the supply chain leading of thousands and millions of people starving.

    Also somewhat related, the ever replacing of the best and most fertile farmland with residential buildings which will constantly diminish Earth's potential food output.