Since pollution is one of the major contributors of global warming, it is important that one is well informed on pollution in order to stop it from growing out of control. Pollution is mostly made up of many different toxic chemicals, of which some (like carbon dioxide and methane) can trap heat in Earth’s atmosphere, like in a greenhouse, hence the term “Greenhouse gases.” All pollution sources add up to a very high amount of pollution released into the air. Some of the major components of pollution include: carbon dioxide, methane, soot particles (this is what makes smog clouds their dark, grayish brownish color), and carbon monoxide, which is a colorless, odorless, toxic gas emitted by cars an trucks. However, pollution can also be created naturally. For example, volcanoes in Siberia, Russia once created an eruption so large, the sooty air an volcanic ash spread all around the globe and effectively blocked enough sunlight to cause a short ice-age. Today, these volcanoes are extinct. Today, pollution is mostly created in vehicles, factories and power plants. Lowering the amount of pollution from these sources would be a major step forward to stopping global warming. If instead of soot the volcanoes spewed car pollution, the world would have heated up instead of causing an ice age. Our job as humans is to prevent that from destroying our world.