GHG Report for Carleton College
Submitted on July 28, 2011; last updated on May 29, 2012
Summary StatisticsMaking fair comparisons between higher education institutions is always challenging due to the rich diversity of higher education. The unverified nature of the information in this database and unavailability of unbiased normalization metrics means such comparisons are even more difficult. Users should therefore approach direct institution to institution comparisons with caution and recognize that all comparisons between institutions are inherently biased.
|Total||Per Full-Time Enrollment||Per 1000 Square Feet||% Offset|
|Gross emissions (Scopes 1 + 2)||21,285 metric tons of CO2e||10.9 metric tons of CO2e||12.1 metric tons of CO2e||3%|
|Gross emissions (Scopes 1 + 2 + 3)||29,179 metric tons of CO2e||15.0 metric tons of CO2e||16.6 metric tons of CO2e||2%|
|Net emissions||28,526 metric tons of CO2e||14.6 metric tons of CO2e||16.2 metric tons of CO2e||N/A|
Emissions Inventory Methodology and Boundaries
|Start date of the 12-month period covered in this report||January 1, 2010|
|Consolidation methodology used to determine organizational boundaries||Operational control approach|
If any institution-owned, leased, or operated buildings or other holdings that should fall within the organizational boundaries are omitted, briefly explain why.
|Emissions calculation tool used||Clean Air-Cool Planet|
Please describe why this tool was selected.
We chose to use the Clean Air-Cool Planet calculator because it not only is used by many other colleges and universities, which enables us to compare our greenhouse gas emissions to other similar institutions but we have also used this calculator for past greenhouse gas reports, which means that we will be able to more accurately compare the changes in our greenhouse gas emissions from year to year.
Please describe the source(s) of the emissions coefficients used.
Clean Air-Cool Planet GHG emissions calculator default coefficients
|Which version of IPCC's list of global warming potentials did you use?||No information provided|
|Who primarily conducted this emissions inventory?||student researchers and the manager of campus energy and sustainability|
Please describe the process of conducting the inventory.
Fossil fuel usage in campus houses and electricity data were obtained from the invoices of our energy provider, XCel energy. Natural gas usage on the main campus was obtained from the Steam Plant (which accounts for almost all of the natural gas used on the main campus) production log, obtained from the Facilities department.
Please describe any emissions sources that were classified as de minimis and explain how a determination of the significance of these emissions was made.
Paper usage was classified as di minimis and emissions from paper were not included. From rough estimates of our paper usage, it seemed that paper made very little difference on our overall emissions. Additionally, we were not able to get data on the number of pounds of paper that Carleton consumes every year as only monetary values were recorded and pounds of paper could not be obtained. Additionally, there was no data available on the recycled percentage for each type of paper that we used. Therefore, considering the very small effect that paper usage has on greenhouse gas emissions overall, we decided not to include it as the data that we could have provided would have, at best, been very simplified estimations
Please describe any data limitations related to this submission and any major assumptions made in response to these limitations.
The biggest data limitation that was encountered was with commuting, as there is no database that records actual commuting information. Therefore, in order to calculate commuting mileage as described above, several assumptions about the commuting habits of faculty and staff (it was assumed that all students walk as all live on or near campus) had to be made. These included 1) Every faculty and staff member drives personal vehicles to school and no one carpools; 2) The longitudinal and latitudinal position of the zip code for each town marks the actual location of residence; 3) The drive from this zip code to Carleton is a straight line; 4) No staff took vacations or holidays (assumed worked every day of the year except for weekends) and no faculty member commuted to Carleton more than the number of days that classes were in session per year (30 weeks of classes and weekends were not included). Clearly, some of these assumptions are incorrect but it was felt that some balanced each other out and that this was the best that could be done given our limited data.
Emissions from the following sources (in metric tons of CO2e)
|Scope 1 Emissions|
|Stationary Combustion||7,784.0 metric tons of CO2e|
|Mobile Combustion||119.0 metric tons of CO2e|
|Process Emissions||0.0 metric tons of CO2e|
|Fugitive Emissions||17.0 metric tons of CO2e|
|Total Scope 1 emissions||7,920.0 metric tons of CO2e|
|Scope 2 Emissions|
|Purchased Electricity||13,365.0 metric tons of CO2e|
|Purchased Heating||0.0 metric tons of CO2e|
|Purchased Cooling||0.0 metric tons of CO2e|
|Purchased Steam||0.0 metric tons of CO2e|
|Total Scope 2 emissions||13,365.0 metric tons of CO2e|
|Scope 3 Emissions|
|Commuting||1,680.0 metric tons of CO2e|
|Air Travel||5,889.0 metric tons of CO2e|
|Solid Waste||325.0 metric tons of CO2e|
|Total Scope 3 emissions||7,894.0 metric tons of CO2e|
|Biogenic Emissions from Stationary Combustion||No information provided|
|Biogenic Emissions from Mobile Combustion||2.0 metric tons of CO2e|
|Carbon offsets purchased||0.0 metric tons of CO2e|
|Offset verification program(s)||No information provided|
Description of offsets purchased (including vendor, project source, etc.)
No information provided
|Renewable Energy Certificates (RECs)|
|Total RECs purchased||0 kWh|
|Percent of total electricity consumption mitigated through the purchase of RECs||None %|
|Emissions reductions due to the purchase of RECs||No information provided|
|REC verification program(s)||No information provided|
Description of RECs purchased (including vendor, project source, etc.)
No information provided
|Sequestration and Carbon Storage|
|Sequestration due to land owned by the institution||653.0 metric tons of CO2e|
Description of how sequestration was calculated
A Carleton ecosystems ecology class calculated the number of metric tons of carbon that is stored in the Carleton College Cowling Arboretum, which is approximately 775 acres, in one year. Using data on the types of plants growing in the Arboretum along with their extent, they estimated that the Arboretum stores 653 additional metric tons of carbon dioxide per year.
|Carbon storage due to composting||No information provided|
Normalization and Contextual Data
|Gross square feet of building space||1,760,309.0 sq ft|
|Net assignable square feet of laboratory space||80,096.0 sq ft|
|Net assignable square feet of health care space||6,159.0 sq ft|
|Net assignable square feet of residential space||588,957.0 sq ft|
|Total Student Enrollment (FTE)||1950.0|
|Full-time Commuter Students||91|
|Part-time Commuter Students||No information provided|
|Non-Credit Students||No information provided|
|Other Contextual Data|
|Heating Degree Days||8295|
|Cooling Degree Days||535|
Please describe any circumstances specific to your institution that provide context for understanding your greenhouse gas emissions this year.
No information provided
|Completed inventory narrative||
Method's for performing Carleton's 2010 Greenhouse Gas Inventory
|Completed inventory calculator||Download|