Environment is not just trees, spotted owls, and rain forests. Environment is a feeling. For example, in the Sudan even though everything is seemingly barren, the land sustains farmers and nomadic herders. People and animals have adapted to a hot, dry climate. The movement of people, the import and export of goods, and mass communication have all played major roles in shaping our world.
People everywhere interact.
They travel from place to place and they communicate. We live in a global village and global economy. People interact with each other through movement. Humans occupy places unevenly on Earth because of the environment but also because we are social beings. A region is the basic unit of study in geography.