This chart shows global man-made CO2 emissions began rising very slightly in the late 1800s, with a significant acceleration beginning in the mid-20th. - ppt download
Carbon Dioxide and Temperature over 500 million Years — NET-ZERO
Carbon dioxide in Earth's atmosphere - Wikipedia
Carbon Dioxide Through Time | EARTH 103: Earth in the Future
A Graphical History of Atmospheric CO2 Levels Over Time | Earth.Org
CO2: Past, Present, & Future – Time Scavengers
Climate Change: Atmospheric Carbon Dioxide | NOAA Climate.gov
co2 levels in atmosphere at their highest in 800,000 years | World Economic Forum
10,000 Years of Carbon Dioxide - Berkeley Earth
Climate Change: Atmospheric Carbon Dioxide | NOAA Climate.gov
Atmospheric carbon dioxide levels for the last 500 million years | PNAS
CO2 levels higher than any point since the evolution of humans | CNN
Trends in Atmospheric Carbon Dioxide
The History of Atmospheric Carbon Dioxide on Earth
A Graphical History of Atmospheric CO2 Levels Over Time | Earth.Org
Climate Milestone: Earth's CO2 Level Passes 400 ppm | National Geographic Society
Atmospheric CO2 levels rise sharply despite Global Economic Shutdown - Human Activity + Rising CO2 Correlation comes into Question - Electroverse
Carbon dioxide now more than 50% higher than pre-industrial levels | National Oceanic and Atmospheric Administration
Atmospheric concentration of Carbon Dioxide (ppm) — European Environment Agency
A Graphical History of Atmospheric CO2 Levels Over Time | Earth.Org
For first time, Earth's single-day CO2 tops 400 ppm – Climate Change: Vital Signs of the Planet
Carbon Dioxide Through Time | EARTH 103: Earth in the Future
