A new study shows that removing native forest and starting intensive agriculture can accelerate erosion so dramatically that in a few decades as much soil is lost as would naturally occur over thousands of years.

Source: phys.org

GR:  Add soil erosion to the top five human impacts:  Construction, invasive species, toxic wastes (including CO2), soil erosion, and harvesting (farming, fishing, grazing, hunting, logging, and mining).  The five are hard to separate, and they all relate to human population growth and migration.