Carbon dioxide levels hitting historic high is the final wake-up call - The Week

At 415 ppm, carbon dioxide level is at highest ever in human history

Carbon Dioxide Reaches Highest Recorded Levels In Human History

A Graphical History of Atmospheric CO2 Levels Over Time

Carbon dioxide levels hit highest mark in human history, despite coronavirus - The Washington Post

Carbon Dioxide Is Rising at Record Rates

Carbon dioxide has hit a level not seen in four million years. This is what it means for the world

Heat Global Warming - So What?

Carbon dioxide now more than 50% higher than pre-industrial levels

War on cow gas is stinky but necessary job in climate-change struggle

Current CO2 levels are near record lows. We are CO2 impoverished. - CO2 Coalition

Revealed: World's CO2 emissions set to rise by about 1 per cent to new record in 2023

Sleeping in a Closed Room - Indoor CO2 Analyze - vThings Blog