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 necessity of participation from many people in school districts for recycling to be effective, while Source 2 suggests that getting all students to follow a specific program can be challenging and may lead to ineffectiveness. This indicates a disagreement about the feasibility of implementing a unified recycling plan in schools with many participants.