Abstract
Mega is a fitting scale to address the most urgent, interconnected issues of our time: rapid urbanization, climate change and energy use, and the loss of biodiversity. The coordination across and among metropolitan regions is crucial to address these challenges. The efficient employment of scales is necessary for coordination and the mega scale is especially relevant for transportation and environmental systems. Scaling both up and down in design and plan-making is important for such coordination. In this paper, the evolution of the megaregion concept is reviewed. Megaregions form when more than one metropolitan region connect. This paper links megaregional principles to practice. Five examples of very large-scale ecologically grounded projects are presented from North and South America. These projects address biodiversity, metropolitan planning, growth management, water quality, and flood control.
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