Exxon Mobil says the world’s plans to hit net-zero emissions by 2050 are slipping further out of reach. The reason? People are pushing back against the high cost of clean energy while coal—the dirtiest fossil fuel—is making a comeback.

In its latest Global Energy Outlook, Exxon predicts global emissions will only drop by about 25% by mid-century. That’s far short of the two-thirds cut climate scientists say is needed to limit the worst effects of global warming.

The company’s forecast is nearly 4% higher than it was last year, pointing to a bigger-than-expected rebound in coal use. Many countries are leaning on coal to keep the lights on when wind and solar power can’t meet demand. On top of that, slower sales of electric cars in the U.S. and Europe mean oil demand is likely to remain stronger for longer.

Exxon says the problem isn’t just technology—it’s also about costs. As energy bills climb, both consumers and governments are hesitating to make the switch to cleaner alternatives.

The warning highlights a growing tension in the global energy transition: how to balance climate promises with the reality of rising demand and the need for affordable power.