I think UWC's values are ... accomplish the mission.
Remove this paragraph as it is devoid of an actual response to the prompt. You need not provide a general opinion statement on the usefulness of the mission and values of UWC since there is no reason to do so. Respond to the prompt only, avoid paragraph fillers that will not help in the assessment of your relationship with the UWC core objectives.
The UWC mission is related to being an anti-racist, diverse, equitable and inclusive institution. I do not get a sense of this in your essay. It appears that you did not do factual research on UWC. You did not go beyond the opening page of their website, hence the irrelevant discussion response that you presented. The objective of the university? To help the youth and future leaders in training understand that "You are needed" to help create an equal world. How do you aim to help spread the information that the youth are needed to change the way our world is today while a student at UWC? Factor in these considerations then revise your response to reflect these UWC goals.
By properly discussing your ideas regarding the UWC values and objectives, you should be able to revise your contribution statement as well to help reflect how sustainability fits into the mission and values statement.