这首诗的主题包括：死亡，友谊，校园枪击案，战争，环境保护，爱，自由。（英文见里面）

The themes in this poem include: death, friendship, school-shooting, war, environmental-protection, love, and freedom.

A comment from Allpoetry:

Papa Terminus - Black being the color of death is a very prominent image for me, the themes from school-shooting, war, and environment, really is quite striking...this really captures the attention in simplistic way, but to me the premise speaks with such volume.