What is the carbon cycle? How does human activity contribute to the carbon cycle?
Carbon, in various forms, continuously circulates between the living world, the atmosphere, oceans and the Earth’s crust. There are many different processes by which carbon is exchanged between these locations. Events, such as fires, which release carbon dioxide into the atmosphere, are known as ‘sources’. The oceans and growing trees remove carbon dioxide from the atmosphere and are known as ‘sinks’.
