Alberta Climate Change: Our emissions are slowing the Earth itself

[CALGARY, AB] — The Earth is spinning more slowly than it used to, and a new peer-reviewed study suggests our own carbon emissions may be partly to blame. That is not the quirky fun fact it sounds like.

What the Science Actually Says

A paper published in the Journal of Geophysical Research: Solid Earth (AGU Publications, DOI: 10.1029/2025JB032161) finds that the Length of Day — the time it takes Earth to complete one rotation — is not fixed. It shifts constantly due to the Moon's gravitational pull and geophysical processes happening inside the planet, on its surface, and in the atmosphere.

The less-studied culprit here is climate. Specifically, what scientists call barystatic processes: the redistribution of mass between continents and oceans caused by melting polar ice sheets, retreating glaciers, and shifts in terrestrial water storage. When ice melts and flows into the ocean, it changes how mass is distributed across the planet — and that changes how fast it spins.

3.6 Million Years of Context, Compressed Into a Warning

The researchers reconstructed Length of Day variations going back to the Late Pliocene — roughly 3.6 million years ago — using a physics-informed diffusion model, a probabilistic deep learning algorithm anchored to paleoclimate proxy data. That is a long baseline. It includes the full sweep of Quaternary ice ages, where massive continental ice sheets waxed and waned and drove large swings in Earth's rotation speed.

The alarming finding: 21st-century climate change may be increasing the Length of Day at a rate that ranks among the highest recorded across that entire 3.6-million-year window. We are not in normal territory.

So What Does a Slower Earth Actually Mean?

For daily life, nothing you would notice at the breakfast table. But for precision systems — GPS satellites, financial transaction timestamps, telecommunications infrastructure — even millisecond-scale shifts in Earth's rotation require constant recalibration. A longer day also has downstream implications for atmospheric circulation patterns and, by extension, climate modelling accuracy.

The deeper issue is what the finding signals, not what it causes directly. If the rate of LOD change is genuinely unprecedented in millions of years of geological history, it is another instrument in a growing dashboard telling us the pace of contemporary climate disruption is historically unusual.

Where Alberta Fits Into a Global Conversation

This study is global science, not Alberta policy. But global science eventually lands on provincial desks. Climate change remains a consistent fault line between Premier Danielle Smith's UCP government and Opposition Leader Naheed Nenshi's NDP. The UCP has historically pushed back against federal climate frameworks while the NDP has pressed for more aggressive provincial action.

Research like this — reconstructing millions of years of planetary data to isolate a contemporary anomaly — is precisely the kind of evidence that sharpens those debates. Whether it moves the needle in Edmonton is a different question entirely.

The Headline Irony, Addressed Directly

The original framing asked: "Good news — Earth is slowing down?" The wry answer is no. A slower Earth, in this context, is a symptom. The same melting ice driving sea level rise along coastlines is subtly redistributing the planet's mass and tugging on its rotation. It is all one system, and the system is accelerating in directions that have not been seen in millions of years.

The real question worth sitting with: if the planet's rotation itself is registering the signal, what exactly are we still waiting to measure before we treat this as urgent?