Pollution

1. Light Pollution

1.1. Streetlights

1.2. Car Headlights

1.3. Light from Buildings

2. Noise Pollution

2.1. Cars

2.1.1. Driving

2.1.2. Honking

2.2. People

2.2.1. Talking

2.2.2. Walking

2.3. Sounds of Industrial Fans and Machines

3. Runoff

3.1. Fertilizers

3.1.1. Algae Blooms

3.1.1.1. Less Organisms

3.2. Oil and Byproducts from Automobiles

4. Trash On Sidewalk

4.1. Paper napkins

4.2. Cups and Plates

4.3. Bottles and Cans

5. Lower Air Quality

5.1. Industrial Waste

5.2. Car Emissions

5.3. Resource Mining

6. Less Habitats for Organisms

6.1. Less producers