Carbon dioxide in Earth's atmosphere reaches record high, researchers say - NBCNews.com
- Carbon dioxide in Earth's atmosphere reaches record high, researchers say NBCNews.com
- Climate change: Greenhouse gas concentrations again break records BBC News
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- Greenhouse gas emissions: Atmospheric greenhouse gas levels reached record high in 2018 CBS News
- Carbon Dioxide Concentrations in Atmosphere Hit Record High, World Meteorological Organization Says Newsweek
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