Spanish Conquest messed around with Peru’s shoreline
So: human trash is altering the face of the earth since centuries? Seems familiar … but this study by Daniel F. Belknap and Daniel H. Sandweiss actually uncovered how the influence of onbrought sicknesses and relocation of whole populations, held the indegene back from covering the seashore ridges with mollusk shells and trash, and so the ocean began to tear down the century-old manmade shoreline.
It always amazes me, how the contact of two civilizations can impact the world around it in so many unforeseen ways.
(link to the original thesis: here)