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 evidence do we have that the increase in CO2 is not part of a natural cycle?

How do volcanic CO2 emissions compare to those from fossil fuel burning?

What happens to oxygen levels when CO2 levels rise due to fossil fuel burning?

What are the tracers that indicate the burning of fossil fuels?

Why is it significant that the CO2 we are measuring comes from sources that were once alive?