Why the population of the black moths decrease in the 1850s?

The population of black moths, specifically the peppered moth, decreased in the 1850s primarily due to industrial pollution in England. As factories released soot and other pollutants, the trees where these moths rested became darker, favoring lighter-colored moths that were better camouflaged against predators. This environmental shift led to a decline in the black moths, highlighting the role of natural selection in response to changing habitats.