what are the four human practices that lead to harmful effects to the environment; what are the 5 major impacts humans have on the environment?; what are 10 ways humans impact the environment?; human activities that affect the environment; how does the environment affect humans; how can we reduce the impact of human activity on the environment?; 5 human activities that harm the natural resources and give some ways to avoid and prevent it; 10 positive effects of human activities on the environment