Why do scientists believe that the population explosion in the south could lead to catastrophic environmental

Why do scientists believe that the population explosion in the south could lead to catastrophic environmental consequences for the entire planet?

Explosive population growth causes severe environmental consequences: pressure on local ecosystems (deforestation, depletion and erosion of soil, drying up of water bodies, desertification), food shortages, local wars, impoverishment, social upheavals, mass migration of the population.

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