Here’s the volcano fact:
Volcanic CO2 emissions are a natural source of atmospheric carbon dioxide, but they are relatively minor compared to human activities. According to scientific estimates, the global volcanic CO2 emissions are approximately 200 million tonnes (0.2 gigatonnes) per year.
In comparison, human activities, primarily the burning of fossil fuels and deforestation, contribute about 35-40 gigatonnes of CO2 per year.
To put it in perspective:
- **Volcanic CO2 emissions**: ~0.2 gigatonnes per year.
- **Human-caused CO2 emissions**: ~35-40 gigatonnes per year.
Thus, volcanic activity contributes less than 1% of the annual CO2 emissions when compared to human activities. Over geological timescales, volcanic CO2 has been an important factor in the carbon cycle, but in the context of recent increases in atmospheric CO2, human activities are the dominant source.