Study concludes NO link between vaccination and autism
Even though the original study that found the supposed link between vaccines and autism has been found to be fraudulent, some people will just not let it go. Vaccinate your children, don't vaccinate them... it's not my business. BUT what I feel is my business would be to spread education about this topic whenever I can. So, here's an actual "meta-study" on the topic that concludes that vaccines do NOT cause autism. Feel free to debate the topic, education and discussion about this is very important.
As for the cause, there's still research being done. There's the possibility that it's environmental but the research is pointing more towards the cause being genetic.
With my son I would guess it's genetic. His oldest son has autism and my son has aspergers. They have been raised for the most part in different households so I feel like it must be more genetic than anything.