What are some ways humans contribute to carbon dioxide in the atmosphere

well, one main way that we add to the CO2 in the atmosphere is the use of fire, coal, and cars that bur gasoline instead of diesel. also factory's that are run through coal furnaces, and steel factory's too. (steel is basically iron mixed with carbon) and the emissions from the processes are great contributors to the CO2 output.

answer >   yes we do, women; have three holes, urethral opening(pee hole, vagina, and the women pee/girls pee out of the urethra like the men do; only they have a single opening to pee/ejaculate.   (sorry if i'm too forward with this, but this is for a biology class, isn't it? )

hope that !         : )