What mode of transport makes the greatest contribution to Global warming ?

>>>>>>>>> My answer will be A. Car.

Wasi,

According to a survey, Air travel releases about130gm CO2 per km compared to124gm released by cars, therefore, the correct answer should be 'C' air travel with car a close second.

All transportation modes combined together account for23% of CO2 emissions globally.

Cheers

Fakhruddin 

Option correct answer A. Car. <<<<<<<<<<<<<

I think road transportation and hence would opt for:

A. Car