We humans have an intrinsic emotional need to connect with nature. The eminent biologist E. O. Wilson first called this need “biophilia,” and the term has stuck. Yet cities also, and fundamentally, need the structure of hardscape urbanism – streets, buildings, and infrastructure – in sufficient density to achieve environmental and economic efficiency and nurture social bonds. It is critical that we incorporate nature into cities, but we must do so in a way that supports urbanity rather than replaces it.
Source: Huffington Post Green