Of interest, climate is one of the five soil forming factors and has a significant influence on the properties of soil. Soils in warmer or wetter climate are more developed than soils in cooler or drier climate. Warm conditions promote the chemical and biological reactions that develop parent material into soil.
I am not 100% sure but I believe that because of increased manufacturing, the air got very polluted and this made many trees darker, like birch. So moths are usually lighter in color so many couldn’t really hide among trees and they were eaten. After some time, many moths mutated and also became darker to blend in when they were on trees to prevent being eaten by predators. In conclusion, the population decreased.
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