All of these are examples of pollution. Each one contributes to environmental degradation:
- Trash build-up: Accumulation of waste can lead to soil, water, and air pollution.
- Ivory trade: This contributes to wildlife trafficking and can harm ecosystems when species are endangered or extinct.
- Deforestation: This results in habitat loss, soil erosion, and can contribute to air pollution through increased carbon emissions.
Therefore, the answer is all of these.