A 35-year cycle of climate changes in the Northern Hemisphere has been identified by scientists. They used a computer model to study how the ocean and atmosphere interact in the North Atlantic and North Pacific. In the North Atlantic, strong ocean currents lead to warmer sea temperatures, affecting the atmosphere and causing changes in evaporation and ocean currents. This, in turn, affects the ocean's circulation and heat distribution, leading to a cooling trend. The researchers also found that recent warming in the Northern Hemisphere matches the pattern of this natural climate cycle.