University of California geologist Duncan Agnew published research in Nature saying the melting of ice in Greenland and Antarctica has contributed to slowing Earth’s rotation, reports Space.com.

While timekeepers have already agreed to stop adding leap seconds by 2035, Agnew claims a negative one will be necessary by 2029 and would’ve been required sooner if not for the effects of climate change. If that’s true — and not everyone agrees that it is — international timekeeping guidelines and the world’s computers will need updates.