2. What has happened to the level of carbon dioxide in the atmosphere in the past several
decades (use numbers and units)?

Nov 23, 2020 · Levels of carbon dioxide (CO2) in the atmosphere hit a new record of 410.5 parts per million in 2019, and are expected to keep rising this year, the World Meteorological Organization (WMO) said in its annual Greenhouse Gas Bulletin on Monday. “We breached the global threshold of 400 parts per million in 2015.

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2. What has happened to the level of carbon dioxide in the atmosphere in the past several decades (use numbers and units)?

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2. What has happened to the level of carbon dioxide in the atmosphere in the past several
decades (use numbers and units)?