Subclinical deficiency is a condition in which a nutritional deficiency that is capable of having an effect on an individual’s health is not severe enough to produce typical deficiency signs and symptoms. Subclinical deficiency is discovered only by biochemical changes and it can change to clinical deficiency if it is not treated.
It affects the layers of the earth the ozone layer which protects us from the sun can't protect very good. Which increases the tempature here on earth.