The graph above shows the monthly CO2 atmospheric concentration reading collected at Mauna Loa (
Next, the variation of month to month comparison is compared for the 10 years period, at the site of Maona Loa. Within a year itself, the range of CO2 atmospheric reading (highest and lowest recording point) is about 5.20 to 6.60 ppmv. By converting the concentration value in ppmv, the weight of CO2 is calculated (like example here). The weight of CO2 is listed in the table below:
As we see the values above, each year there is a huge amount of CO2 is fluctuating in the atmosphere. It might look small in concentration reading (as small as 5-6 ppmv), but in terms of weight, it is almost 2-2.5 times of human activity related CO2 emission: 2.413E+10 tonnes.
Another comparison is made as well. There are 10 sites recording the CO2 atmospheric concentration, as listed previously here. The average reading of one year recording at each site is compared to other 9 locations. The range of the reading is as big as 4.44 ppmv among these locations around the world. Translating this concentration number into CO2 weight, a difference of 2.931E+10 (or 29.31 billion) tonnes to 34.70 billion tonnes of CO2 is noted. Again, this number is exceeding the anthroprogenic CO2 emission (24.13 billion tonnes).