Human: What is an argument against the use of pesticides? Assistant: 
An argument against the use of pesticides is that they can be harmful to human health and the environment. Pesticides are designed to kill insects, but they can also harm other living things such as birds, mammals, and fish. They can also pollute the air, soil, and water, which can lead to further environmental damage. Additionally, many people believe that using pesticides can cause a decline in biodiversity, leading to fewer species on Earth.