I personally would choose the board game fundraising Even though this not applicable for all, the large majority of book readers belong to the introvert personality side. Because of this, activities that made into fundraising should be something that appealing to introverts in General (which definitely acceptable by extroverts since they basically good in all social situations), such as board game fundraising.
Some background knowledge the readers should have on recycling for the best understanding is what products and materials should be recycled, what recycling means, and why it is important to recycle.