Human geography covers a wide range of topics. It includes, for example, the study of patterns of human populations and the various ways in which people make their livings. By studying human geography, we can understand such patterns and can correlate them with environmental conditions. This will help us to better understand the causes of environmental problems.
For example, we can look at patterns of population and the distribution of industry and agriculture in the drainages of certain rivers. We can then look at pollution in those rivers and in the seas into which they empty. Such a study could tell us what kinds of environmental problems are associated with various patterns of human population and economic activity.
In this way and many others, the study of human geography can inform our understanding of environmental problems.