This disclosure provides methods for encouraging golfers and other users to use greenhouse gas reducing golf balls. Greenhouse gas reducing golf balls may include carbon dioxide absorbents, in order that the golf ball may reduce atmospheric carbon dioxide levels to aid in alleviating global warming. The methods may include determining a degree of usage of a used greenhouse gas reducing golf ball, and awarding a reward to a user based on the degree of usage. The methods thereby promote the use of certain greenhouse gas reducing golf balls instead of conventional golf balls, and encourages the reuse of those greenhouse gas reducing golf balls.