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Earth has two beating hearts, of sorts, beating not at a rate per minute, but rather beating at a steady, consistent, life-giving 2 beats per year. Where are these terrestrial hearts located? The polar regions (read here and here). Without Earth’s hearts life on this planet would be very different. Earth’s hearts pump life-giving oxygen, nutrients, and energy to the remotest parts of our world.Earth’s hearts pump when each year the floating sea ice expands and contracts by millions of square kilometers. Ice sheets expand by salt water freezing during the cold months of the year. When this happens, salt is squeezed from the freezing water, creating a dense brine, which falls to the ocean floor. As it falls it displaces water, pushing it forward to help drive the ocean circulation. The cycle is repeated when the ice melts later in the year and then refreezes again, repeating the cycle. A curious thought. Is there any relationship to the beating rate of Earth’s hea