18 Nov 2014
A couple of years ago, my son was watching a cartoon where one character discussed his villainous carbon foot print (a giant foot). This showed me both how widespread the use of the term “carbon footprint” had become and how little anyone seems to know what to do with or about that information. A group at the University of Michigan recently released findings calculating the City of Detroit’s cumulative carbon footprint and presented their report to Mayor Duggan’s office.
Not surprisingly, the study reported that some 66% of the City’s emissions come from stationary sources including residential and commercial buildings and another 30% result from transportation. Those are known to be large sources of emissions.
What I found interesting is that 41% of the city’s total emissions are produced in just 4 of the City’s 33 ZIP codes – primarily from the City’s southwest, midtown and downtown areas. Citywide, greenhouse gas emissions totaled 10.6 million metric tons of CO2 equivalents in 2011 and 2012. According to the report, if you drove from Detroit to Ann Arbor 60 times, your car would emit roughly one metric ton of CO2. Also interesting is that, on a per capita basis, Detroit’s 2012 emissions are below average when compared to data previously collected from 13 other U.S. and Canadian cities. Detroit’s per capita emissions ranked 9th-lowest among that group—below Cleveland, Denver, Pittsburgh, Ann Arbor and Washington, D.C. Per capita emissions were lower in Baltimore, Boston, Minneapolis, Chicago, Philadelphia, Toronto, Seattle and New York City. That one always surprises, but New York with its many tall buildings is surprisingly efficient on a per-capita basis. The report shows that electricity use contributed 45% to 2012 citywide emissions, in large part because of DTE Energy’s fuel mix, which includes 76% coal.
Now that we know where the City’s “low hanging fruit” of CO2 emissions can be found, the City may be able to work on assisting its property owners and businesses to reduce those emissions, which typically go hand-in-hand with cost savings. That’s often the best way to sell such changes – not based on an environmental change, but based on an economic one. One more thing for Mayor Duggan’s team to work on.