[zeugma]

So, which is it?

Earth is spinning faster than it used to. Clocks might have to skip a second to keep up.

or

Melting polar ice is slowing the Earth's rotation, with possible consequences for timekeeping

[Elsie]

The melting polar ice is a mass close to the axis the earth spins around. As the ice melts, it flows DOWNHILL to the ocean, where the seas gradually rise (mass is moving!) the mean radius of the earth is now slightly larger, thus, to conserve the angular momentum, the spinn rate slows down.

Ya got an office chair that spins freely?

Try it your self!

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https://www.scientificamerican.com/article/bring-science-home-spinning-chair/

[Elsie]

https://www.scientificamerican.com/article/bring-science-home-spinning-chair/