The two sources disagree on the effectiveness and practicality of implementing recycling programs in schools.
Source 1 emphasizes that requiring school districts to recycle will have a positive impact on reducing greenhouse gas emissions, highlighting the importance of participation from many people in schools for effective recycling.
On the other hand, Source 2 points out the challenges and limitations, stating that recycling programs can be expensive and difficult to implement successfully within schools, which might lead to ineffective outcomes.
Therefore, the fact on which the two sources disagree is about the effectiveness and feasibility of recycling programs in schools.
In terms of the specific content options you provided, the closest answer to the disagreement would be:
"There are too many people in a school district to follow one plan."
This reflects the concern from Source 2 regarding the challenges of achieving effective participation in recycling programs among a large number of people.