While the concentration of carbon has increased, the carbon originating from natural sources has decreased." href="https:// .jpg" target="_blank" comes from natural sources, and how much comes from combusted fossil fuel sources.
Scientists agree that today’s warming is primarily caused by humans putting too much carbon in the atmosphere, like when we choose to extract and burn coal, oil, and gas, or cut down and burn forests.
Scientists have gathered evidence and have improved their methods for teasing apart natural and human factors.
Over the years, δ13C has decreased while the overall amount of CO concentrations since the pre-industrial era.
Many natural and human factors (also called drivers) influence the climate.