Answer:
1. The effect is it kills animals and damages ecosystems. there could be soil erosion, flooding, and greenhouse gasses.
2. Since almost every car in the world is internal combustion engines, they give off carbon monoxide and other pollutions. This could cause climate changes in those areas and harm other organisms.
3. It harms absolutely everything. There is absolutely no gain from this besides a faster way of transportation. There are way more negative effects than pros in deforestation in the world. Us humans also need forests and plants for oxygen.
Step-by-step explanation:
If you have any questions feel free to ask in the comments - Mark