"the-state-of-greenhouse-gases-in-the-atmosphere-based-on-global-observations-through-2013" .
"The State of Greenhouse Gases in the Atmosphere Based on Global Observations Through 2013"^^ .
"2014"^^ .
"https://public.wmo.int/en/media/press-release/globally-averaged-co2-levels-reach-400-parts-million-2015"^^ .
"report" .
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