The two sources disagree on the effectiveness and feasibility of successful recycling programs in schools.
Source 1 implies that the participation of many people (i.e., school districts) is necessary for recycling to effectively reduce greenhouse gas emissions, suggesting that a large number of participants can lead to a successful outcome.
In contrast, Source 2 highlights the challenges faced by schools in implementing recycling programs, mentioning that getting all students to follow a specific program is not easy and can lead to ineffectiveness.
Therefore, the correct response is:
Successful recycling programs require the participation of many people.