Why would Autism Speaks lie about what causes it? They wouldn't.
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link to www.autismspeaks.org (secure)]
"No effect on risk
Vaccines. Each family has a unique experience with an autism diagnosis, and for some it corresponds with the timing of their child’s vaccinations. At the same time, scientists have conducted extensive research over the last two decades to determine whether there is any link between childhood vaccinations and autism. The results of this research is clear: Vaccines do not cause autism. The American Academy of Pediatrics has compiled a comprehensive list of this research."
"Increased risk
Advanced parent age (either parent)
Pregnancy and birth complications (e.g. extreme prematurity [before 26 weeks], low birth weight, multiple pregnancies [twin, triplet, etc.])
Pregnancies spaced less than one year apart
Decreased risk
Prenatal vitamins containing folic acid, before and at conception and through pregnancy "
It is not caused by vaccines. Before vaccines were around, look at how rampant stuff was going around.