Diesel engines have been demonised for their emissions but the technology has already cleaned up its act.
Many people thought U.S. gasoline consumption had already peaked. They were wrong. What happened?
Faced with stringent fuel economy standards but cheap gas, automakers may seek to delay CAFE rules. What's the best way to reevaluate these emissions-cutting rules?
American consumers just aren't prioritizing fuel efficiency in a time of low gasoline prices. Is there a way to reverse the trend and make progress on climate change?
Obama's proposal to add $10 tax to crude oil raises the thorny question of whether the U.S. can continue to fund its highway infrastructure with a fuel tax that hasn't changed since 1993.
With cheaper gas, consumers are buying fewer fuel-efficient vehicles – a step backwards on climate, energy security and upkeep of our highway and bridges.