greenhouse gases workgroup 1 where does word atmosphere come from 2 what are the 5 most abundant atmospheric 3 how is heated 4 a gas 8 6 different 7 has amount of changed coming 9 maryland s emissions 10 projected levels comes latin atmosphaera which was cobbled together greek atmos meaning vapor and sphaera translated as sphere quite literally then in nitrogen n2 78 pph oxygen o2 20 21 99 00 argon ar 0 934 ppt 93 h20 04 400 ppm 97 carbon dioxide co2 0369 370 any that thermal or radiative properties this means
