The main factor in the emergence of human races?

Official science equates differences between human races with differences between populations in animals, although there are other, no less logical theories. Still, let’s say a race is a population, not a separate species. A population is a large group of individuals that has been isolated for a long time in a certain territory and in the process of evolution was able to adapt to it, which can be clearly manifested in the external characteristics of individuals, including. That is, the main factor of human races is also the environment in which we live. The formation of external signs of representatives of the race depends on the amount of food in a certain territory, the air temperature, the amount of precipitation, the dose of the natural background of ultraviolet radiation, the measures for providing drinking water, and so on.