To explore the ecological footprint of a modern high-school student.
Once you finish an academic year, you can pass your textbooks down to a younger cousin, sibling, or a close friend. Not only do you help them save money, but you're also clearing out space on your shelves and reducing paper wastage.
Sadly, the turnover of school curricula has led to a high replacement rate for textbooks and similar student resources. However, as the team behind this site can attest, it is always useful to have old textbooks to work with, for extra exercises, worksheets, and a different perspective on content.
A caveat, however: students must always be familiar with their subject syllabus, so that they can quickly select relevant information from these pre-loved textbooks.