A Natural Cycle - How Do We Know

The video explains how CO2 emissions from burning fossil fuels differ from natural sources. It highlights the role of bookkeeping in tracking fossil fuel usage and compares emissions from volcanoes and fossil fuels. The video also discusses the relationship between oxygen levels and CO2 emissions, showing that oxygen decreases as CO2 from fossil fuels increases. Finally, it identifies tracers that confirm the burning of fossil fuels, which were once living organisms.

What new insight or understanding did you gain from this video?