Average temperature anomaly (standard base period): The 1930's and 40's vs. the 1980's and beyond.

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Source: NASA

These maps give some idea of the slower temperature response of the oceans, due to their higher heat capacity. It takes much more energy to warm the oceans even a fraction of a degree, and so the sea surface doesn't warm as fast as the land masses. Since they cover most of the planet, they retain and distribute a great deal of heat, producing a lag between climate forcing and it's full atmospheric effect.