Applying multi-scale thinking
"Systems approaches usually involve consideration of phenomena acting at multiple scales. Urban health depends critically on actions taken and natural systems operating outside city boundaries. Similarly, cities impact areas far beyond their own borders, including not only surrounding areas but planetary systems (e.g., climate, trade, and migration, the spread of innovation, and the dissemination and adoption of good practices). Within cities, actions are taken by institutions at many scales, and urban systems often generate inequities. Understanding such issues requires the explicit application of multi-scale thinking."
Quote from: https://ehjournal.biomedcentral.com/articles/10.1186/s12940-016-0107-2