I wonder how much of the reduction in Portland's CO2 is really from the urban growth boundary or from change in behavior from the population. I would think that due to Portland's renown as a place that has alternative transportation and an urban growth boundary it would attract a certain set of people and detract another. I haven't read any studies on this, but I suspect that a large segment of Portland's old population (read: people who lived here before and during the 90s) left Portland and moved to Vancouver, but this shift in population was more than made up by attracting persons who were interested in this lifestyle. Hence people who were interested in living in a "livable" city moved here and people who would be more interested in, what has become, a traditional sprawling city.
I'd be very interested in this article's methodology and what it defines as "Portland."
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