This thesis is a comparative analysis on the sustainability prefromance of Pepsico, Mondelez International and Nestle , and concludes that the ESG ratings are a relevant indicator of sustainability. This thesis suggests that organizations routinely review, measure and report on their ESG perfromance. It also suggests that these organizations should improve their disclosure rate to build trust in their ESG prefromance, and it also examines their overall influence on the enviroment as world-leading corporations in their feild. This thesis also concludes that all three of the food giants (Nestle, Mondelez International, & PepsiCo) are still engaged in a path towards sustainability, and becoming Green Food Giants will need continued commitment, innovation, and adaptability on their part.