Numerous factors enter into the problem of the control of climate, and climate is subject to change. The geologists tells us that we have had many variations of climate in the past, and we know that we have many varieties, sometimes even in the same locality, in New England, for instance. What are the things that determine the climate for a particular place? The radiation from the Sun, the composition of the atmosphere that permits certain radiations to get through and shuts others out, the way the wind blows, the way the water flows, the heights of mountains and their locations in respect to the oceans and directions of prevailing winds, and a host of other influences.