As a result of complications like these, global carbon dioxide emissions reached a record high last year, rising 0.4 percent from 2024 levels. The pace of the increase, however, is declining as renewables rise. For years, emissions declines were driven by developed countries like the United States and European Union member states. Last year, however, emissions from advanced economies grew faster than emissions from developing countries for the first time since the 1990s, according to the IEA.

The trend reversal was driven by the U.S., where coal demand rose 10 percent last year. Rising natural gas prices prompted power producers to switch back to coal, which had been displaced by fracked natural gas in recent years. Plus, electricity use rose thanks to a harsh winter across much of the eastern part of the country, as well as the rollout of industrial-scale power customers like the data centers needed for new artificial intelligence applications.