The two sources disagree on the point regarding the effectiveness and practicality of implementing recycling programs in schools due to the large number of people involved and the challenges that come with it. Source 1 emphasizes the necessity of participation from school districts to have an impact on the environment, while Source 2 highlights the difficulties in getting all students to follow a specific program, suggesting it could lead to ineffectiveness.
Therefore, the answer is:
There are too many people in a school district to follow one plan.