Fact 1: Riding a bike does not cause pollution.

Fact 2: Visual pollution caused by littering is pollution, just as is water pollution and air pollution.

Given the two facts above, answer the question "What is not caused by riding a bike?" with the following options: 
- momentum
 - flooding
 - coal
 - disease
 - speed
 - Allergies
 - litter
 - exercise


 

       litter  