New Scientist: WHICH is the biggest climate villain: cars, planes, ships or trains? Overall, road vehicles cause the most warming – in recent years, at least. Jan Fuglestvedt of the Centre for International Climate and Environmental Research (CICERO) in Norway, and colleagues, inventoried the various types of emissions that were generated by transportation in 2000. They then calculated how each one-year “pulse” of emissions will warm the globe this century. The car and truck emissions caused …