The Huronian ice age might have been caused by the increased oxygen concentration in the atmosphere, which caused the decrease of methane (CH4) in the atmosphere.
Azaman samedan huronienne adobat ajaraw ən ijji ən assiwad ən assəməssudu ən ufass daɣ jənəj akal, adorawən afanaz ən méthane (CH4) daɣ jənəj akal.