Mobile transportation, like: private cars, jeepneys and buses use energy and burn petroleum. During the combustion process, these mobile transports exhaust fumes that contain nitrous oxides, carbon dioxide and other particulates that pollutes the air and contributes to global warming.
As an additional information, China is considered as the country to produce most fossil fuel CO2 emission in 2015, followed by the United States.
Trojan Asteroids orbit a larger planet where the gravitational pull of the sun and the planets are balanced, im not sure if the answer is correct though. good luck!
