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Supertopics:
Rising Levels of Atmospheric Carbon Dioxide through 2019
Carbon Emissions Continue to Climb 2019 part one

Earth's CO2 levels are the highest in 3 million years      web

webhttps://www.usatoday.com/story/news/nation/2019/04/04/global-warming-earths-carbon-dioxide-levels-highest-3-million-years/3367027002/
authorDoyle Rice
publicationUSA TODAY
date2019-04-04

Documents:
CO2 level is unprecedented over the past 3 million years
webM. Willeit, A. GanopolskiScience Advances2019-04-03

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