Bus carbon dioxide (CO2) emissions for the last 10 years can be found in Table 3.7 of Transport Statistics Great Britain (TSGB) at:
The Department for Transport's most recent forecasts of total road transport carbon dioxide emissions for England were produced as part of the road transport forecasts for 2010, 2015, and 2025. These are available in ‘Road Traffic Forecasts 2008: Results from the Department for Transport's National Transport Model', which is available at:
The total forecast changes in carbon dioxide emissions for Public Service Vehicles (PSVs), which includes buses and coaches, forecast percentage changes in PSV carbon dioxide emissions in England compared with 2003 for 2010, 2015 and 2025 are provided in the following table:
Percentage 2010 -3 2015 -2 2025 -0.4
These figures include an assumption for rising congestion levels, causing slowing vehicle speeds and increasing CO2 emissions as a result.
No such forecasts are available for 2020, 2030, and 2060.