The causes of global warming are many, and there are many reasons to why global warming spread. The first cause is the sun's heat and the increasing of the temperature.

Other causes of global warming is the air pollution that in the atmosphere, volcanic emissions, variations in the earth’s orbit and greenhouse gases.The causes for the last warming are still being researched and scientists proved that the increasing level of gases (like CO2) from human activities is a major cause of global warming.
Other gases can be main causes for the global warming is the gases that came from factories and the cars or other vehicles. Yet another cause Smokers effects the environment by smoking cigarettes or other things. People should care and challenge to be sure that solutions are put to use.