Increasing CO2 in the atmosphere Science Education for the Early Grades › Forums › Volume One › Learning Progression “A”: Nature of Matter › Lesson A-7. Air: A Mixture of Gases (Mixtures and Chemical Reactions) › Increasing CO2 in the atmosphere Tagged: Carbon dioxide This topic has 1 reply, 2 voices, and was last updated 2 months, 4 weeks ago by Starryfields. Viewing 1 reply thread Author Posts June 30, 2017 at 12:26 pm #3587 Bernard NebelKeymaster The natural cycles normally keep the atmospheric concentrations of gases constant, but our prodigious burning of fossil fuels is now causing a marked increase in the level of carbon dioxide as shown in this graph. https://climate.nasa.gov/news/916/for-first-time-earths-single-day-co2-tops-400-ppm/ This, in turn, affects climate. Please post questions. November 23, 2019 at 2:44 pm #8133 StarryfieldsParticipant NASA has updated their site: Carbon Dioxide Author Posts Viewing 1 reply thread You must be logged in to reply to this topic.