How have human factors contributed to climate change, and what evidence supports these factors?

The claim that most CO2, CO, Freon, and other similar things, is produced by humans is true because most of such gasses that ruin the environment are created due to mass use of cars, due to factories that produce them, due to chemicals we use for cleaning or similar. They wouldn't normally be released into the air at such pace, so it's us who do it.