According to a back of the envelop calculation the global mean temperature would drop from 000 K to 000-000*00/000=000 K, that is very cold. This is a very rough estimate but without carbon dioxide in the atmosphere our planet would definitely be a much colder place and of course a planet without any life. Reply Pehr Bjornbom says:  August 0, 0000 at 0:00 AM  