Human-driven climate change has 'slowed the Earth's rotation' and could affect how we measure time, study suggests
The melting of ice in Greenland and Antarctica is said to have slowed the rotation of the Earth because it has changed where the planet's mass is concentrated.
Maybe we can get Aquaman to call all the shrimp in the ocean to one side of the world. That should slow the spin like a washing machine with a big load of sheets in it. That's what I would do.