How much has CO2 concentration in atmosphere increased ?

Below is some data gathered on CO2 concentration in Earth's atmosphere. The references are also listed.

• As per IPCC report, warming caused by humans was approximately 1 deg C above pre-Industrial levels in 2017 [1].

• And it will increase at 0.2 deg C per decade (high confidence) [1]. Also warming greater than global average has been seen in some regions, with higher average warming over land than oceans [1]. 

• Global average atmospheric carbon dioxide in 2020 was 412.5 parts per Million (ppm) [2] against pre-Industrial levels (1750) of 280 +/- 10 ppm [3].  

• The present atmospheric CO2 concentration in atmosphere has not been reached during the past 420,000 years, and likely also not for the past 20 million years [3]. I personally find this fact quite astonishing!

• Since 2000, global atmospheric carbon dioxide amount has grown by 43.5 ppm, an increase of 12 percent [2]

References:

1. Intergovernmental panel for Climate Change. (2022, May3). Summary for policy makers. Chapter1. Executive Summary. https://www.ipcc.ch/sr15/

2. NOAA Science & Information for a Climate-Smart Nation. Climate Change: Atmospheric Carbon Dioxide. https://www.climate.gov/news-features/understanding-climate/climate-change-atmospheric-carbon-dioxide. Accessed on 22 May 22.

3. Intergovernmental panel for Climate Change. Report: The Carbon Cycle and atmospheric Carbon Dioxide. https://www.ipcc.ch/report/ar3/wg1/the-carbon-cycle-and-atmospheric-carbon-dioxide/