Alcohol use in teens is generally used as an escape, having a good home to come to makes a large difference in the life of a teen.
Pretty intuitive i think, would you rather get drunk cause your family is involved in your life and loves you or when your family hopelessly despises your very existence... ide go for the latter
People littering and throwing rubbish on streets, to avoid it from happening place more bins in areas for people to throw their rubbish or address the situation to others.