Author's Purpose and Tone — quick quiz

Read the passage and answer the question. "The streets of our city are filled with litter. Plastic bags fly in the wind, food wrappers pile up near bus stops, and bottles roll on the pavement. This is not just ugly—it is dangerous to our health and harmful to animals. We must act now. Every citizen should carry a cloth bag, dispose of waste properly, and join weekend clean-up drives. Our city deserves better, and only we can make the change." What is the author's main purpose in writing this passage?