A Scientific American magazine article raised the possibility that nature-deficit could cause autism.
The following website attempts to highlight the theory:
www.naturedeficitrelateddisorders.com
The website points to various studies that that found a higher rate of autism amongst groups that have low nature-exposure & vice versa (such as the study that found lower rates of autism in Amish communities, lower rates of autism in rural populations, cable TV study etc).
Is this a plausible theory?