The concentration of carbon dioxide in the atmosphere peaked above 430 parts per million in 2025—the highest in millions of years. Current energy policies put us on track for around 3°C of warming by 2100. This upward trajectory is a direct result of continued fossil fuel use, likely exacerbated by emissions from extreme wildfires last year, fossil fuel extraction methane leaks and possibly greater permafrost emissions, alongside decreased ability of very warm oceans to absorb CO2. There’s a small chance global temperatures could surpass 2°C in at least 1 of the next 5 years.
Climate Crisis Blog
