Perpetual motion ...

Earth is heating up. Which means ... her ocean currents are running faster due to global warming.

To whit

Winds over the ocean have been picking up at a rate of 1.9% per decade, the researchers found. This increase in wind speed transfers energy to the ocean’s surface, and subsequently, deeper waters. About 76% of the upper 6,560 feet (2,000 m) of the oceans have seen an increase in kinetic energy since the 1990s. Overall, ocean current speeds have crept up about 5% per decade since the early 1990s, the study found.

What changes this will make, nobody knows.