The fact on which the two sources disagree is:
There are too many people in a school district to follow one plan.
Source 1 emphasizes the need for participation from a large number of people in school districts to make recycling effective, while Source 2 suggests that getting all students to follow a specific program is challenging, indicating that the large number of people can hinder effectiveness. They both recognize the challenge, but Source 1 is more optimistic about involvement, while Source 2 points out the difficulty of executing the program.