Higher fuel efficiency cars and alternative fuels will help reduce air pollution, energy, and CO2 emissions growth, but these improvements threaten to be significantly offset by growth in total automobile use.
(Higher fuel efficiency cars and alternative fuels; will help; reduce air pollution, energy, and CO2 emissions growth) (these improvements; threaten; to be significantly offset by growth in total automobile use) (these improvements; to be; significantly offset by growth in total automobile use) (these improvements; significantly offset; by growth in total automobile use)
Higher fuel efficiency cars and alternative fuels these improvements these improvements these improvements
will help threaten to be significantly offset
reduce air pollution, energy, and CO2 emissions growth
to be significantly offset by growth in total automobile use
significantly offset by growth in total automobile use
by growth in total automobile use