>>2019482This is a graph of CO2 concentration in the air. The little yearly curve is because of fluctuations in those 96% natural carbon dioxide, which you conveniently forget to mention is offset by an approximately equal consumption of carbon dioxide. It's just the normal carbon cycle - consumed to produce biomass, consumed when biomass is burnt in one way or another. More CO2 is produced during winter, more consumed during summer, you get the deal.
That slow but steady rise in concentration (from pre-industrial 280ppm to over 400ppm now, that's a 40% increase), that's because of your 4% human production. It adds up.
