CO2 now comparable to levels seen 4 million years ago: NOAA
By A Mystery Man Writer
How the World Passed a Carbon Threshold and Why It Matters - Yale E360
Climate change: Carbon dioxide levels are higher than they've been at any point in the last 3.6 million years - CBS News
Increase in atmospheric methane set another record during 2021
A Graphical History of Atmospheric CO2 Levels Over Time
CO2: Past, Present, & Future - Time Scavengers
CO2 Past
Earth's carbon dioxide levels hit record high
CO2: Past, Present, & Future - Time Scavengers
New CO2 Record Prompts a Scientist to Ask, 'What's It Going to Take for Us to Wake Up?
Do high levels of CO2 in the past contradict the warming effect of CO2?
Carbon dioxide reaches another milestone, continues to impact climate
CO2 at Mauna Loa exceeds 420 ppm for the first time in human history - The Weather Network
USA
Despite COVID-19 shutdowns carbon dioxide and methane surged in 2020 – NOAA data reveals
CO2 Now at Levels Unseen in 3.6 Million Years - In These Times
- Carbon Monoxide, CO
- Carbon Dioxide Removal (CDR) To Clear the Air, Look Beneath
- Trees and Carbon Dioxide: What Is the True Connection?, by R. Philip Bouchard, The Philipendium
- Carbon Dioxide in Atmosphere Hits Record High Despite Pandemic Dip - The New York Times
- Climate change: Global carbon dioxide emissions reach record high
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