Answer: water pollution
Step-by-step explanation:
A negative effect of lawn fertilizer and pesticide is the water pollution. Fertilizers in the lawn are used for the availing the nutrients to the nutrient poor soil which can promote the growth of the plants and the pesticides are added to kill the disease causing insects. The surface runoff due to water can take away chemicals present in fertilizers and pesticides in the soil to the nearby water body. This will contaminate the water of the water body. Hence, will result in water pollution.