Portland, Oregon has been celebrated as one of the leading green cities in America. Due to land use planning aimed at limiting sprawl, transportation infrastructure that has prioritized public transit over single occupancy vehicles, and a populace both home grown and those who have migrated here, it's a place that seems to walk the talk with one of the highest bicycle commuting rates in the nation and an overall carbon emissions rate that is down 15% since 2000, and below 2% of 1990 levels. Despite this devotion to sustainability, there are some stubborn indicators that there is more hard...