.5o years ago- There were more trees and forests ,there was less pollution as there were less factories and vehicles, the water bodies were clean. If there were forests so animals were living in forest happily ,as forests are the homes of animals.etc.
Today- A lot of pollution ,more factories and vehicles .Mostly water bodies are dirty ,very less trees more deforestation. people suffer diseases by this, now there are less forests so animals that lives in forests are suffering and loosing their homes. etc.