Carson's main argument is that pesticides have detrimental effects on the environment; they are more properly termed "biocides", she argues, because their effects are rarely limited to the target pests. DDT is a prime example, but other synthetic pesticides come under scrutiny as well, many of which are subject to bioaccumulation. Carson also accuses the chemical industry of intentionally spreading disinformation and public officials of accepting industry claims uncritically. Most of the book is devoted to pesticides' effects on natural ecosystems, but four chapters also detail cases of human pesticide poisoning, cancer, and other illnesses attributed to pesticides. About DDT and cancer, the subject of so much subsequent debate, Carson says only a little: