Sustainable Infrastructure
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I read an interesting article in the latest edition of Maclean's last night, entitled Building a better city. If you look at how an ecosystem works, it spends as much time on maintaining itself as growing, unlike human systems.  Our infrastructure deficit is continuing, making the cost of replacement greater every year we keep sticking our heads in the sand. The infrastructure deficit is estimated at $123 billion in 2007, up exponentially from $12 billion in 1985 and $60 billion in 2003.