Geography is a discipline that enables us to understand the Earth in which we live from a spatial and an ecological perspective. It is about the study of places and regions including their locations, their characteristics, processes that shape them, as well as how and why they are changing. It develops knowledge and understanding of the distribution of physical and human phenomena, and interprets patterns and processes that affect our physical and human worlds. Geography is also concerned with the interactions between people and environments. It looks at how physical systems affect human activities and how human actions modify physical environments. It analyses the impact of people-environment interaction and explains the diverse responses of people in different places at different times. In addition, geography makes global understanding possible through studying the interconnectedness and interdependence of not only places, but of the physical, economic, political and social contexts in which we live. In this connection, geography involves the study of contemporary issues of sustainability on different scales (from local to global), with particular focus on how people-environment interactions can be managed and improved in a sustainable manner.