A new policy in India aims promote cellulosic biofuel production from sustainable feedstocks, something no other country has managed to do. Can the country succeed?
Despite a nod to supersonic aircraft in the new FAA reauthorization, CO2 and noise standards are still uncertain.
Despite ICAO's reliance on alternative jet fuels to decarbonize the avaiation industry, production does not appear to be keeping up.
By offering substantial incentives for low-carbon vehicles and raising the cost for high emitters, Sweden's feebate system can play a vital role in shifting demand toward more efficient vehicles.
If China wants to maximize the benefit of its emission area control zones, it should go beyond its own territorial waters.
A clear air future appears to be on the horizon for London, a city that is rapidly positioning itself as a model for zero-emission transportation.