In the article, scientists explore how chemicals move and change in the environment, including air, water, soil, rocks, and living things like plants and animals. For instance, harmful metals can be found in all these parts of the environment, even in the air as dust. The researchers show that studying pollution in just one part of the environment isn't enough because pollutants can travel and affect everything around them. They suggest that to really understand and tackle pollution, we need to look at how it moves and stays in different parts of the Earth's interconnected systems.