This article presents an overview of the role of the ocean currents in the climate systems and the ways they affect terrestrial and marine ecosystems. The first section discusses how the ocean currents influence global and regional climate. The second section discusses paleoclimate evidences of the past instability of the ocean circulation and future modeling projections of the ocean circulation changes under global warming. The third section discusses results of model simulations and paleoclimate evidences of the impact of reorganizations of the ocean currents on terrestrial and marine ecosystems.
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