FAST TRAINS.

Except for bicycles, mass transit is the greenest of transportation technologies. Experts may quibble about whether electric and hybrid-electric vehicles yield net energy and carbon savings, but there's no doubt that to the extent travellers can be lured from cars onto trains, substantial efficiencies result. As for air travel, greenhouse gas emissions are so great some green-minded indviduals try to avoid it altogether.

While the focus of the article is on China’s train technology, the dogmatic assertion above leaves me unimpressed.