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

RealClimate: As Soon as Possible

Earth's CO2 hits highest recorded level in human history - exceeding 420 parts per million

Pathways to net-zero emissions from aviation

A Graphical History of Atmospheric CO2 Levels Over Time

Greenhouse gas reaches alarming new record

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

Carbon Dioxide Through Time EARTH 103: Earth in the Future

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

Effects of acute exposures to carbon dioxide on decision making and cognition in astronaut-like subjects

On Utqiagvik's edge, an observatory measures the gases that are warming the Arctic and the planet • Alaska Beacon

CO2 Concentrations Hit Highest Levels in 3 Million Years - Yale E360

Emissions from wildfires hit record high in 2021 as climate change drives fire threat