The Earth is wobbling more than it should and humans are probably the cause

Looking at the Earth from afar, it seems to be a perfect sphere, but it is not. Because the Earth is not uniform on all sides because of the land masses that change and change over time, our planet falters a little when it turns. Now, a new study by researchers at NASA's Jet Propulsion Laboratory and several universities and science centers has identified the causes of the Earth's imperfect spin, known as "polar movement," and found that humans contribute to it.

The researchers used a wealth of data collected over more than 100 years to develop mathematical models to trace the causes of oscillation and found that three factors were at stake and that man was responsible for it.

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Two of the three factors identified by scientists are glacial bounce and mantle convection. Glacial rebound occurs when thick layers of ice physically push the land masses, compressing them, and releasing that pressure during melting. The earth then rises over time, causing an oscillation of the Earth as if it were slightly off-axis. The effects of the last ice age, which would have compressed a huge amount of land on many continents, are still being felt today in the form of a glacial bounce.

Mantle convection, the other uncontrollable factor of the Earth's oscillation, is related to the inner workings of our planet. The plates on the surface of the Earth are in constant flux due to the movement of liquid rock far below our feet. Researchers believe that these currents also contribute to the imperfect spin of the planet.

The third and final factor identified by scientists is the massive loss of ice on Greenland and other regions as a direct result of global warming through human activities. Researchers estimate that Greenland has lost about 7,500 gigatonnes, or 7,500,000,000,000 tons of ice because of global warming.

All this ice loss occurred in the 20th century and the production of greenhouse gases was cited as the main culprit. Losing all this mass has caused a major change on the planet and has also contributed to the flicker.

"With these three major contributors identified, scientists can distinguish the changes in mass and polar movements caused by long-term terrestrial processes over which we have little control over those caused by climate change," writes NASA. "They now know that if the loss of ice in Greenland accelerates, it is likely that the polar movement will be too."

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