Atmospheric carbon dioxide levels reached a record high of over 430 parts per million in 2025, the highest in millions of years, according to NOAA and Scripps Institution of Oceanography. This surpasses the previous record and represents a significant increase from the previous year. Scientists warn this escalating CO2 concentration, driven by fossil fuel combustion and deforestation, will accelerate global warming and its severe consequences, including extreme weather and sea-level rise. Despite being overshadowed by political news, experts emphasize the long-term criticality of this milestone.

Prepared by Olivia Bennett and reviewed by editorial team.