The amount of carbon dioxide (CO2) in the Earth's atmosphere has increased significantly over the last 150 years due to human activities, particularly the burning of fossil fuels. Prior to the industrial revolution, the atmospheric concentration of CO2 was relatively stable at around 280 parts per million (ppm).
However, with the widespread use of coal, oil, and natural gas, as well as deforestation, the concentration of CO2 has risen steadily. the atmospheric CO2 concentration had surpassed 415 ppm, which represents a significant increase of over 45% compared to pre-industrial levels.
It's important to note that the rate of CO2 increase has accelerated in recent decades, with an average increase of approximately 2 ppm per year. This rise in CO2 levels is a primary driver of global warming and contributes to the ongoing climate change. It's worth mentioning that the specific CO2 concentration at any given time can be found through reputable sources that provide up-to-date data on atmospheric CO2 levels.