[ocean wave sounds]
The oceans are absorbing extra heat
as the planet warms.
But exactly how much heat is difficult to measure.
NASA scientists are developing a new method
based on Earth's magnetic field.
Water conducts electricity,
so as the ocean tides cycle,
they push and pull on the magnetic field,
providing information on ocean temperatures.
Better measurements of ocean heat content
will help scientists understand the impacts of a warming climate.