What is the fine-grained topic of the following text: GA - Executives at Coca-Cola have decided to go forward with a proposal by the company’s chief chemist, Dr. Ima Pepper, who recommended, a year ago, that the beverage giant begin recycling the popular soft drink’s “base.” The base is the fluid that comprises the liquid--in this case, purified water--to which the beverage’s other ingredients are added to give the soda its distinctive texture, color, and taste. Only return the topic.
Coca-Cola's decision to recycle the base of their soft drink