Global warming: Carbon dioxide reaches another record level

How the World Passed a Carbon Threshold and Why It Matters - Yale E360

Greenhouse gas emissions - Wikipedia

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Greenhouse gases, facts and information

What is climate change? A really simple guide - BBC News

Radiative forcing - Wikipedia

Greenhouse Gas concentrations hit record high. Again.

co2 levels in atmosphere at their highest in 800,000 years

Carbon dioxide levels hit historic high, Environment News

If carbon dioxide hits a new high every year, why isn't every year hotter than the last?

Global Energy Review: CO2 Emissions in 2021 – Analysis - IEA

Carbon dioxide levels 'exploded' last year to reach record highs not seen since end of Ice Age, scientists warn, The Independent

Climate-heating gases reach record highs, UN reports, Greenhouse gas emissions

Global warming: Carbon dioxide reaches another record level

Earth Matters - Carbon Dioxide Reaches Record Levels, Plus 6 Things to Know About the Greenhouse Gas