The Earth's days are getting longer, and humans may be the culprit. This phenomenon, largely attributed to climate change, is causing our planet's rotation to slow down, resulting in a lengthening of our days. The study, conducted by geoscientists from the University of Vienna and ETH Zurich, analyzed fossilized marine organisms called foraminifera and developed a deep-learning algorithm to assess sea-level flux and calculate Earth's changing day length across almost 4 million years. The findings reveal that our days are currently lengthening by 1.33 milliseconds per century, a rate that has been largely unparalleled in millions of years. This rapid increase in day length implies that the rate of modern climate change has been unprecedented at least since the late Pliocene, 3.6 million years ago. The study's authors suggest that this effect hasn't been matched in eons, save for a few abrupt climate events during which ice sheets grew or melted as Earth quickly cooled or warmed. The shift in Earth's mass distribution, caused by melting glaciers and polar ice sheets, is akin to an ice skater slowing their rotation by extending their arms outward. This redistribution changes our planet's oblateness, or how much it bulges in the middle, and has a direct impact on our day length. The current rapid rise in day length can thus be attributed primarily to human influences. The study's implications are significant, as they suggest that human activities are altering the very mechanics of our planet's rotation. This raises a deeper question: what are the long-term consequences of this rapid change in day length? From a purely scientific perspective, being able to change the rotational mechanics of an entire planet is a testament to human capability. However, the net effect on our planet is negative, leading to slightly longer workdays and other potential disruptions. The study was published in the Journal of Geophysical Research: Solid Earth. This research highlights the profound impact of human activities on our planet's natural processes, and it serves as a stark reminder of the urgent need to address climate change and its consequences.
