we know for certain that autism spectrum disorder is caused by
In no certain order, I have read the following explanations for autism over the years: Autism is caused by mercury. Autism is caused by lead. Autism begins with poor maternal bonding. Certain pesticides may trigger autism. Plastics. Gluten aggravates autism spectrum disorder. People with autism should eat more strawberries. Too much automotive exhaust is a leading cause of autism. Chemicals found on non-stick cookware may trigger autism.
But on the other hand, it sort of is an epidemic. Other families are going to have babies and maybe they would like to have some idea of how to prevent this tricky spectrum disorder from striking. My own children will have their children, and if autism is indeed caused by automotive exhaust, it would be good to know so we could all buy electric cars.