Viewed in this way, an essential policy that developed and developing countries should pursue in overcoming the crisis is to build infrastructure suitable for the twenty-first century. This includes an efficient electricity grid fed by renewable energy; fiber and wireless networks that carry telephony and broadband Internet; water, irrigation, and sewerage systems that efficiently use and recycle fresh water; urban and inter-city public transit systems; safer highways; and networks of protected natural areas that conserve biodiversity and the habitats of threatened species.