Transcript Slide 1
Greenhouse Gas Inventory 2008 Update 2008 Greenhouse Gas Inventory - Duke University Methodology • Utilized Clean-Air Cool-Planet software - (www.cleanaircoolplanet.org/) • Goals of the inventory – Update Duke’s 2004 GHG inventory – Characterize the major sources and examine trends in emissions over the last 18 years – Provide the baseline for Duke’s overall Climate Commitment Action Plan • Boundaries of the inventory – “Duke proper” – University and Health System buildings on and adjacent to the Durham campus and the Marine Lab. – Did not include leased space or satellite health system buildings and hospitals 2008 Greenhouse Gas Inventory - Duke University Sources of GHG Emissions Inventoried • Transportation – Fleet fuel • Gasoline – University BP gas cards – FMD purchases – DUPD purchases – West Campus grounds gasoline purchases • Diesel – Gallons sold at Transit fueling station – – 2008 Employee Air travel • Used Duke American airlines data for FY0506, 0607 to get an average price per mile • Took Employee Travel and Reimbursement financial data on air travel purchases / avg. price per mile Commuters • Used 2006 and 2008 TTA survey data for mode share info • Used a straight-line analysis of employee address data to estimate an average daily commute distance Greenhouse Gas Inventory - Duke University Changes in 2008 Inventory • Transportation – Employee Air travel • Not included in 2004 Inventory because of a lack of data • As part of the Climate Commitment we are required to include this – Commuters • Used actual 2006 and 2008 TTA survey data for mode share info – 2004 numbers were estimated • Durham Regional and Duke Raleigh employees were not included in the employee commute distances – may explain some of the reduction, 15 miles to 9.1 miles 2008 Greenhouse Gas Inventory - Duke University Sources of GHG Emissions Inventoried • Electricity – Duke Power consumption • Used 5 main Duke accounts, counts for 95% of the electricity usage • Included Marine Lab • On-Campus Stationary – Steam Plant fuel • Coal • Natural Gas • #2 Fuel Oil 2008 Greenhouse Gas Inventory - Duke University Changes in 2008 Inventory • Electricity – Duke Power consumption • Updated emissions factors for specific Duke Energy data back to 1990 • 2004 inventory used regional average from the Southeastern Electric Reliability Council (SERC). • On Campus Stationary – Steam Plant fuel • Duke uses a combination of recycled #2 fuel oil and regular #2 fuel oil, emission factors are the same – didn’t separate out • Previous inventory didn’t have emissions factors tied to the usage of recycled #2 oil, under-reporting impact 2008 Greenhouse Gas Inventory - Duke University Sources of GHG Emissions Inventoried • Refrigerants – Estimated from FMD and E&O purchasing data minus current inventory • Solid Waste – Landfilled solid waste – Incinerated medical waste • Fertilizer – Usage data from FMD, Washington Duke Inn, Athletics and Duke Gardens – Nitrogen content averaged across all four sources • Offsets – Duke Forest preservation • Sequestration potential hasn’t changed since 2004, forest management and size has stayed the same – Composting – REC purchases 2008 Greenhouse Gas Inventory - Duke University Changes in 2008 Inventory • Fertilizer – Not included in previous inventory • Square Footage – 2004 numbers from Plant Accounting were not consistently gross square feet – Updated numbers back to 1990 with new gross square feet to maintain consistency 2008 Greenhouse Gas Inventory - Duke University Questions? 2008 Greenhouse Gas Inventory - Duke University T otal Emissions (Metric T ons eCO2) 500,000 450,000 )eCO2 (Metric Tons 400,000 350,000 300,000 250,000 200,000 150,000 100,000 50,000 1990 1992 1994 1996 1998 2000 2002 2004 2006 Year 2004 levels = 377,489 + 10.5% 2005 levels = 416,951 15% increase since 2004 + 6.5% 2006 levels = 444,002 2007 levels = 433,961 2008 - 2.3% Greenhouse Gas Inventory - Duke University Total Carbon Dioxide Emissions (kg CO 2 ) Emissions by Scope 2006-2007 500,000,000 450,000,000 400,000,000 350,000,000 300,000,000 Transportation 23% 250,000,000 200,000,000 Steam Plant 24% 150,000,000 100,000,000 Purchased Electricity 53% 50,000,000 0 1990 1992 1994 1996 1998 2000 2002 2004 2006 Year 2008 Greenhouse Gas Inventory - Duke University kg eCO2 / Square Foot Building Space 40 Total Emissions per square foot (kg eCO2 / ft^2 ) 35 30 25 20 15 10 5 0 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2004 = 30.0 2008 2005 = 31.3 2006 = 32 2007 = 31.2 Greenhouse Gas Inventory - Duke University Total Mt eCO2 vs. Net Mt eCO2 500,000 450,000 400,000 350,000 Mt eCO2 300,000 250,000 200,000 150,000 100,000 50,000 0 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 Year Mt eC02 2008 Net Mt eCO2 Greenhouse Gas Inventory - Duke University 2007