“Humanity produces a staggering amount of CO2: 35 billion tons of it each year....To “turn back the clock” on climate change ....to reach 350 parts per million—the level of atmospheric carbon dioxide in 1988—”
I wish these folks would compare apples to apples. What is 350 ppm in tons? (Or - what is 35 billion tons in ppm?)
Found it:
“Although our output of 29 gigatons of CO2 is tiny compared to the 750 gigatons moving through the carbon cycle each year...”
I tried to find the math that translated parts per million to the mass in metric tons. It was almost impossible to find when writing my comment. However, I finally found this: one ppm of CO2 is equal to about 7.821 metric tonnes. What I wrote gave the metric tons as well as the parts per million, which would explain everything you would need. With that additional info, you will have a more complete understanding.