What adds the element carbon to the environment?

Carbon is added to the environment just by humans and higher animals breathing in oxygen and breathing out carbon dioxide. But by far the biggest contributor of carbon to the environment especially the atmosphere is the burning of fossil fuels which then contribute to the greenhouse gases which in turn cause global warming. Water vapour, carbon dioxide, methane and ozone are the main  constituents of greenhouse gas. 

Hey i wanna tell your dad to come over and get some food

Um i don't know i ethier