Atmospheric concentration of CO₂ has increased from below 300 ppm historically to over 400 ppm presently.

Name: Atmospheric concentration of CO 2 has increased from below 300 ppm historically to over 400 ppm presently.
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The statement refers to the atmospheric concentration of CO2 (carbon dioxide), which has indeed increased from below 300 parts per million (ppm) historically to over 400 ppm in recent years, largely due to human activities such as burning fossil fuels and deforestation.

Atmospheric Concentration of CO2 Has Increased from Below 300 Ppm

Atmospheric Concentration of CO₂ Has Increased from Below 300 Ppm