CO2 is about 0.4 of one thousandth of the Earth's atmosphere. 422 parts per million. 420-ish ppm 0.04% as a percentage 0.0004 as a proportion. OP's statement is wrong. she is a stupid kike. ( i.e Not 0.0004% ) oh, by the way, I almost forgot: all you faggots who posted and didn't realize this completely obvious fact are a bunch of fucking worthless morons. you're all fucking stupid.