If we dug milions of pits like mine shafts into the earth, would a lot of the CO2 in the atmosphere, being a denser heavier gas than O2 and N2 and others, fall into these holes via density displacement and be trapped here, thus sequestering it? -TL Winslow , Pansophist master of STEM and world history

https://www.quora.com/If-we-dug-milions-of-pits-like-mine-shafts-into-the-earth-would-a-lot-of-the-CO2-in-the-atmosphere-being-a-denser-heavier-gas-than-O2-and-N2-and-others-fall-into-these-holes-via-density-displacement-and-be-trapped/answer/TL-Winslow