Green advantage is not guaranteed

While all modes of public transport have an environmental advantage over car travel, the scale has been eroded in recent years, as emissions from new cars have fallen and emissions from public transport have increased.

The performance of new cars has improved significantly over the past decade with emissions per km falling 17% to 158g of CO2 per km. Car journeys are now responsible for nearly 60% of transport emissions, but in absolute terms are slightly lower than they were in 2000, despite...