Carbon Account For Transport Volume 9, 2017


1  The next interim target is for total emissions from Scotland, including international aviation and shipping, to reach 40.72 Mt CO2e by 2020. See page 3 of the Annual Targets Order

2 The Draft Climate Change Plan is available to view here.

3 Greenhouse Gas Inventories for England, Scotland, Wales & Northern Ireland: 1990-2015, National Atmospheric Emissions Inventory, Department for Business, Energy and Industrial Strategy, 2017.

4 The emissions inventory does not produce a continuous time series – no figures are available for 1991 to 1994 and 1996 to 1997.

5 A mega-tonne is 1 million tonnes = 106 tonnes. A kilo-tonne is 1,000 tonnes = 103 tonnes.

6 All greenhouse gas emissions are given in carbon dioxide equivalent, which is denoted CO2e. This means that the global warming potential of non-CO2 greenhouse gases is converted to that of CO2 in order to make comparisons easier. For example, the global warming potential for methane (CH4) over 100 years is 21. This means that emissions of one million metric tons of methane are equivalent to emissions of 21 million metric tons of CO2. (OECD)

7 Emissions adjusted to account for Scotland’s participation in EU-wide emissions trading and are used to measure progress against targets.

8 Scottish Greenhouse Gas Emissions 2015, The Scottish Government, 2017,

9 References to transport emissions as a whole in this document include IAS, except where stated.

10 Volume 8 of the Carbon Account for Transport reported a very slight fall in transport emissions for 2014 on the previous year. The rise reported for 2014 in volume 9 is attributable to methodological changes in the emissions inventory. 

11 Scottish Transport Statistics Table 8.1.

12 Scottish Transport Statistics Table 8.1

13 Scottish Transport Statistics Table 7.1

14 Unless otherwise referenced, all kilometres quoted in section 2.4 are from Scottish Transport Statistics Table 5.3.

15 Scottish Transport Statistics Table 2.3a. Note that these may not match the internal kilometres quoted in the special focus box. The emissions inventory is also not clear on the definition of a bus. This could be a public service vehicle, but could also be a vehicle with 9 or more seats, as per the Department for Transport definition.

16  Note that because of the lack of data for the period 1991-1994 and 1996-1997, a linear extrapolation of the data is depicted in this graph.

17 Including aircraft support vehicles

18 Greenhouse gas reporting: conversion factors 2017, Department for Business, Energy and Industrial Strategy, 2017.

19  This was the assumed opening date at the time of the environmental statement.

20 Impact from operational emissions

21 Alternative fuel vehicles include hybrids, bioethanol and liquid petroleum gas.

22 Policy paper: Vehicle Excise Duty, HMRC, 2015.