Diffusion is the movement of molecules from regions of concentrations to regions of concentration until is reached.

Diffusion is the movement of molecules from regions of greater concentrations to regions of lesser concentrations until equilibrium is reached.

Well, both latitude and intensity of light affect temperature because, the higher the light intensity, the higher the temperature and since latitude is the measure of how close you are to the equator, then the closer to the equator you are, the higher the temperature is.