In case you haven’t noticed, there’s a serious debate going on among parents about whether or not vaccinations cause autism. And no wonder, as the numbers keep going up: New statistics from the CDC show that autism now affects a staggering one in 68 kids and jumped more than 400% in 20 years. Everyone wants to know why. And a recent study brings new evidence to support the theory that our environment—not our vaccines—is causing the autism spike.