What might happen if warm and cool currents did not move through the ocean's waters?

There would be no ocean tides.

Ocean temperatures would become either too hot or too cold to support life.

The pace of global warming would accelerate.

Climates on land might be extremely different.

Marine life would be altered or even destroyed due to the lack of nutrients and dissolved oxygen that is necessary for marine life.

Changes in the movement of warm and cool currents would impact the global water cycle, leading to changes in precipitation patterns and droughts or floods in different regions.

The weather patterns in different regions around the world would be impacted due to the fact that ocean currents are known to influence atmospheric conditions by impacting ocean temperature and salinity.

The formation and intensity of hurricanes could be affected; warm ocean currents fuel hurricanes, and a lack of warm currents could prevent hurricanes from developing.

Overall, the ecological balance of the planet would be severely disrupted if ocean currents stopped moving through the waters of the ocean.