The two sources disagree on the effectiveness and practicality of recycling programs in schools.
Source 1 emphasizes the necessity of school districts' participation in recycling programs to have a positive impact on the environment, indicating that a successful recycling program can indeed be effective with many participants. On the other hand, Source 2 argues that getting all students to follow a specific recycling program can be challenging and may lead to ineffectiveness, implying doubts about successful participation.
Therefore, the correct answer is: There are too many people in a school district to follow one plan.