15 MITIGATION
Minimizing Change: Climate Mitigation
GHG emissions per resident were less than 13 tons in 2009, the lowest level in the six years that City Government has been tracking emissions. This reflects the overall stability of total emissions in relationship to the city’s increasing population. However, per capita emissions have fluctuated considerably. Given fluctuations in weather from year to year that affect energy use, the 2009 economic recession, and other sources of variation, there is no clear sign yet of an overall change in Boston’s GHG emissions.
GHG Reduction Goals In 2007, Mayor Menino set the goal of reducing municipal GHG emissions 7 percent by 2012 and 80 percent by 2050. In 2009, he asked the Climate Action Leadership Committee and Community Advisory Committee to establish GHG goals for the entire Boston community. After considering the likely effects of various levels of greenhouse gases in the atmosphere, the practical
29% 53% Commercial/Industrial
18%
Transportation Residential
Boston Community Greenhouse Gas Emissions 8.5
GHG emissions (tons)
8.4 8.3 8.2 8.1 8.0 7.9 7.8 7.7 2003
2004
2005
2006
2007 2008
2009
2010
2009
2010
Boston Community GHG Per Capita Emissions 14.0 GHG emissions (million tons)
Roughly half of the emissions come from commercial, industrial, and institutional sources, one-fourth from residences, and one-fourth from transportation. The residential and commercial/industrial emissions include those from the disposal of solid waste, which accounts for only two percent of the total. Another way of summarizing the data is that three-fourths of emissions come from building use and one-fourth comes from transportation.
2009 Community GHG Emission by Sector
UPDATE 2011
The 2009 total was slightly less than the 2005, 2007, and 2008 emissions, but greater than the 2004 and 2006 totals.
BO STO N C LI M AT E AC T I O N P LA N
In 2009, the Boston community was responsible for the emission of about 8.2 million tons of greenhouse gases (measured as carbon dioxide equivalent, eCO2). Twothirds of the emissions are tracked by the measurement of energy actually used; the other one-third of emissions come from sources that require estimates based on models and other approximations. Detailed GHGemission inventories for the Boston community and for municipal operations are located on the Boston Climate Action website.
13.8 13.6 13.4 13.2 13.0 12.8 12.6 12.4 2003
2004
2005
2006
2007 2008