How do human activities impact the environment? Objective Students will explore how human activities impact the physical environment of North America, focusing on pollution. Background To successfully implement a lesson on pollution and human impact for second graders, the teacher needs a solid grasp of various types of pollution (such as air, water, and littering) and their effects on the environment, presented in an age-appropriate manner. Understanding the educational standard 2.G.HE.1, which focuses on how human activities impact the physical environment of North America, is crucial. Conte Duration: 60 Minutes.