Current estimates range from 0.11 to 0.24 Tg of transport-related N2O emission per year, though with rapidly increasing global car use, N2O emissions from this source may rise in the future. Additional N2O emissions arise from other forms of fossil fuel-powered transport such as planes, boats and lorries.

The increased use of catalytic conver-tors in cars around the world has led to concerns about the resulting increase in transport-related N2O emissions. However, although catalytic convertors in cars can lead to an increase in N2O emissions of ~20 times that of comparable vehicles without catalytic convertors, global emissions from this source are thought to be relatively small.

Indeed, advances in catalytic convertor technology have led to significant reductions in such N2O emissions in recent years.

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