There are three types of magic system in the world I'm building. One of them, Sundancing(tentative name), can manipulate thermal energy. So they are able to take energy from an enviorment, cooling it down, store it, and use it later to various purposes, all of them relasing the heat back.
My question is, what would be the greater consequences to the world of people using this power in the long run, specially in the climatic sense.
P.S: Suppose everyone has the potential to use such ability to various degrees of sucess.
Edit: The average Sundancers can take all energy in the environment in a spherical zone of radius of one meter, up to -20 Celsius. If they want to cool it more, they would have to release that energy elsewhere before doing it again.
As for time scales, maybe in a year, a hundred, a thousand, a million+, up to the one were the damge would be the greatest.