Calculating carbon from travel David Mc. Guigan
Key travel areas § commuting to work/study by staff and students § other non-commuting staff and student travel § fleet travel (eg estates management, mail runs) 2
Why calculate carbon emissions? § to provide baseline information § to allow for effective travel planning § to allow for monitoring effectiveness of measures by repeat surveys 3
How to calculate carbon emissions § § § § survey of staff and students on commuting disaggregate by campus/department ask about usual one-way trip to work/study ask about attendance ask about travel mode(s) ask about distances ask anything else you want 4
The calculation § calculate one-way carbon emission for each mode used: distance * emission rate § add the emissions for each mode § double for daily emissions § annualise using attendance information 5
Sample of carbon emission rates kg of CO 2 per mile or per passenger mile % of small car Motorcycle 0. 024 9% Bus 0. 045 16% Train 0. 024 9% Taxi 0. 23 82% Petrol, medium, car 0. 36 129% Petrol, large, car 0. 44 157% Diesel, medium, car 0. 19 68% Mode 6
Growthing up § relate responses to populations § calculate growth factor (ideally disaggregated by campus and status of respondent) § add growth factor as a new field to each individual survey record § sum growth factors to create carbon footprints for whole college/university and other disaggregations 7
Example of growth factor calculation School FG/UG Population Responses Growth Factor M & VM PG 1, 030 145 7. 10 M & VM UG 2, 066 316 6. 54 S&E PG 1, 851 379 4. 88 S&E UG 5364 919 5. 84 H & SC PG 3749 562 6. 67 H & SC UG 10, 948 1, 227 8. 92 - 25, 008 3, 548 7. 05 Total 8
Sample of carbon emissions by campus Weighted Count Average distance (miles) Estimated CO 2 / year (tonnes) Average estimated CO 2 / year per staff member (tonnes) Easter Bush 230 10. 2 248. 4 1. 08 Pollock Halls of Residence 203 7. 7 141. 9 0. 70 Western General Hospital 352 10. 2 246. 9 0. 70 NRIE / QMRI, Little France 581 8. 5 359. 7 0. 62 Central Area 3, 858 7. 1 1, 358. 3 0. 35 King’s Buildings / Royal Observatory 1, 811 5. 9 627 0. 35 Other location 90 6. 5 28. 9 0. 32 Moray House / Holyrood Road 572 7. 3 169. 9 0. 30 Summerhall 108 4. 6 26. 6 0. 25 Other NHS sites 76 3. 9 18. 4 0. 24 New College / Mylne's Court 63 13. 2 10. 2 0. 16 7944 7. 1 3, 236. 30 0. 41 Location Total 9
Web-based surveys § § are less expensive avoid routeing errors allow immediate feedback to respondent encourage better response rates for some survey types/respondents § are more environmentally friendly 10
Example Survey 11
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