Their carbon intensity in use depends almost entirely on the source of the electricity that is supplied to power the trains.

The fuel mix and associated carbon intensity of most sectors have tended to be very stable over time.

The uncertainty range in projected carbon intensity was large.

The carbon intensity depends on the country of origin.

Credits are generated from fuels with lower carbon intensity than the standard.

Deficits result from the use of fuels with higher carbon intensity than the standard.

None of these regulations, however, were based on carbon intensity of fuel.

So, for the next few years at least, it's likely that the carbon intensity of the electrical power sector will continue to drop.

China is planning on reducing its carbon intensity by 45% over the next decade.

China cutting carbon intensity by 45% from 2005 level by 2020 is not going to happen.