What is it called when any unwanted by-products remaining in the environment and posing a potential hazard to human health or life.?

These unwanted by-products are typically referred to as "hazardous waste." Hazardous waste can include a variety of substances, such as chemicals, heavy metals, and pollutants, which can pose significant risks to human health and the environment. Proper management and disposal of hazardous waste are essential to mitigate these dangers.