It is better to find the cause, and change it. In most cases, the causes of negativity are within us. Even if you lived in a castle made of "Himalayan Salt Lamps," that would not change your internal, psychological states. Observe the facts: who is negative, and why? Meditate on the facts (not theories, guesses, assumptions), and ask for guidance to find the antidotes, which again, in most cases, will be psychological.
Studying this book will help, too:
http://gnosticteachings.org/books-by-samael-aun-weor/treatise-of-revolutionary-psychology.html