CO2 in the atmosphere just exceeded 415 parts per million for the first time in human history | TechCrunch
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 | Vital Signs – Climate Change: Vital Signs of the Planet
Graphic: The relentless rise of carbon dioxide – Climate Change: Vital Signs of the Planet
7. Is the current level of atmospheric CO2 concentration unprecedented in Earth's history? Answer | Royal Society
co2 levels in atmosphere at their highest in 800,000 years | World Economic Forum