Estrogen mimicking chemicals! They are the most likely culprit behind the massive gender imbalance in babies born in Inuit communities across the arctic. According to the Guardian article. "In the communities of Greenland and eastern Russia monitored so far, the ratio was found to be two girls to one boy. In one village in Greenland only girls have been born." Women in these villages were found to have extremely high levels of estrogen mimicking chemicals in their blood, and since it is known that enough of these chemicals can alter the sex of a fetus, the case against estrogen mimickers is pretty strong. The Inuit are victims of a combination of wind and water patterns and bioaccumulation. A lot of estrogen mimickers are carried to the arctic by air and water, and accumulate as they go up the food chain, meaning that the largely meat eating Inuit are subjected to huge doses.
The article does not mention it, but I infer that a substantial number of the girls being born are chromosomally male. They have the manly Y chromosome, but its action in development has been completely undone by the estrogen mimickers. I wonder if this means there will be some cases of girls growing penises at puberty.