Which of the following could be a consequence of improper pesticide use?

Improper pesticide use can significantly lead to environmental contamination, which encompasses the introduction of harmful chemical residues into soil, water, and the broader ecosystem. When pesticides are misapplied or overused, they can runoff into nearby waterways, affecting aquatic life and leading to broader ecological imbalances. Additionally, incorrect application can harm non-target organisms, disrupt local wildlife, and pose health risks to humans and pets. This contamination can persist over time, creating long-term adverse effects on the environment.

In contrast, increased crop yields, reduced pest populations, and improved soil health are typically associated with proper, judicious pesticide use and integrated pest management practices designed to minimize potential negative outcomes. Therefore, while these could be positive consequences of responsible pesticide application, they do not represent the risks associated with improper use.