The symbol has to be original (not that well known or obvious). Symbols also do not have to be just one item ---- they can be a scenario or a series of items, e.g. the "destruction of wildlife" could be a scene depicting a field where flowers are dying one by one under a great orange fiery sun (the sun representing the intensity of those who wish to take wildlife for their own gain).
Why does Kafka use a beetle to symbolize Gregor's loneliness and isolation?
What could you use as a symbol for TWO of the following?
- The threat of terrorism
- Increasing violence in schools
- Destruction of wildlife habitat
- Feeling of alienation and "not belonging"
- An inability to decide what you want to do when you grow up