McGinn claims that insects became resistant to DDT when ingested while Roberts claims that DDT acts only as a repellant. McGinn says ‘In order to control a disease, why should we poison our soils, our waters and ourselves?’ (Pg.289) Donald reacts by stating Science Magazine that species did not go extinct and DDT levels had declined after its use was stopped. DDT only reaches a concentration in water of 1.2 parts per billion, so the claim that it causes the death of algae is false. Birds and sea lions have not declined due to DDT as claimed, while in reality, statistics have proven their increase during the use of DDT.