In chapter 4 of Atomic Habits, the author talks about how our environment can affect our habits. He explains that our surroundings can either make it easier or harder for us to stick to our habits. For example, if we want to eat healthier, we should keep healthy food in our kitchen and avoid buying junk food. The author also suggests that we can design our environment to make our habits more attractive. For instance, if we want to read more, we can keep books in a visible place and make sure our reading area is comfortable and inviting. Overall, the chapter teaches us that we can use our environment to support our habits and make them easier to maintain.