These are substances designed to kill or control unwanted organisms, including insects, weeds, fungi, and rodents. In the context of AP Human Geography, their use is most prominently examined within the study of agriculture and its impacts on the environment and human health. For example, insecticides target insects that damage crops, while herbicides control weed growth that competes with desired plants.
Their employment allows for increased agricultural yields and protection of crops from devastation by pests, contributing to food security and economic benefits for farmers. Historically, the advent and widespread adoption of these substances marked a significant shift in agricultural practices, enabling the production of larger quantities of food. However, overuse or improper application can lead to a number of adverse consequences, including environmental pollution, resistance among pest populations, and potential harm to human health through consumption of contaminated food or exposure during application.
