This panoramic view shows how are focused today the relationships between Nature and the City by research scholars and practitioners in North America. In the American context of an “endless city”, it develops four key ideas for a better approach to urban ecosystems: urban ecology, sustainability, new regionalism and landscape urbanism. Urban ecology has emerged as an interdisciplinary approach for understanding the “drivers, patterns, processes, and outcomes” associated with urban and urbanizing landscapes. With the leadership of several American cities, as New York City, Chicago, Seattle and Portland, urban greening efforts based on principles of sustainability are developed. The new perspectives on regionalism are evident in different eff...