Public Service Announcements can make a difference because they influence your mind (in a good way). And if you follow their example you can make a good impact on the environment. Also, due to the fact that it is visual and public the PSA gives you a message; to support the message it usually gives you an important info. For example a good PSA could be against global warming, or racism, and/or healthy life style. That is how PSAs make a difference.
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