These days, living in big cities makes you feel that our environment is becoming increasingly worse. The air is not fresh or clean, and neither is the water. There are airplanes flying overhead instead of pretty birds, which produce so much terrible noise1. There are so many vehicles thundering along crowded roads, too.When did the sky lose its color? When did streams feed no fish?2 When did birds stop singing and beasts start disappearing? The sky looks grey, the river are black, the grass is white with plastics. You will easily get your hair and shoes dirty while walking along the streets, and the air smells terrible. These days, living in big cities makes you feel that our environment is becoming increasingly worse. The air is not fresh or clean, and neither is the water. There are airplanes flying overhead instead of pretty birds, which produces so much terrible noise1. Are so many vehicles thundering along crowded roads, too.When did the sky lose its color? When did streams feed no fish?2 When did birds stop singing and beasts start disappearing? The sky looks grey, the river are black, the grass is White with plastics. You will easily get your hair and shoes dirty while walking along the streets, and the air smells terrible.