Indirectly, yes, greenhouse gases are already affecting ocean currents. Because greenhouse gases change the temperature patterns globally, this assuradly affects ocean currents, which are essentially giant convection currents which redistribute warmer and cooler water, as well as water with varying salinity levels, throughout the oceans. As global temperatures change, these currents will change. Also, the melting of polar ice caps also poses as a factor the changing of currents as the ice caps are freshwater and the addition of more freshwater as the caps melt will have an effect on the global current network.
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