An analysis of the major factors influencing climactic variation over Earth's surface, including a discussion of the effect of differential heating at different latitudes, the impact of continentality and sea breezes, the causes of monsoons, the coriolis effect, atmospheric circulation cells, the jet streams, and thermohaline circulation currents in Earth's oceans. Recommended pre-listening is Episode 88: Cartography and Earths Seasons, and Episode 89: The Atmosphere.