Uniformity of crops soon became commonplace across entire continents — while the intensive use of fertilizers encouraged weed growth, and pesticides destroyed beneficial insects as well as pests.
Monokultuuride kasvatamine levis peatselt üle tervete kontinentide, samas kui rohke väetiste kasutamine hoogustas umbrohu kasvu ja pestitsiidid hävitasid nii kasulikke putukaid kui ka kahjureid.