This week in Las Vegas, tech companies at CES 2026 are unveiling the latest wearable health devices — glucose monitors, blood pressure trackers, fitness trackers. Probably not mentioned at the show is that these gadgets might be creating a massive environmental problem.

It isn’t something that tends to get much attention, but a new study from Cornell University and the University of Chicago found that by 2050, demand for health wearables could hit 2 billion units per year, or 42 times more than today. Unless we change how they’re made, these devices could generate over a million tons of electronic waste and 100 million tons of carbon dioxide over that same period, the authors warn.

An even bigger surprise is that it’s not the plastic that’s the problem. The study, published in Nature, found that the printed circuit board — the device’s “brain” — accounts for 70% of its carbon footprint, largely due to intensive mining and manufacturing.

The researchers suggest two fixes: develop chips using common metals like copper instead of rare minerals like gold, and make devices modular so the circuit board can be reused while the outer covering gets replaced.

Wrote one of the study’s co-authors, “When these devices are deployed at global scale, small design choices add up quickly.” It’s something to think about while scrolling through CES announcements.