What were the causes and effects of the irish potato famine?

The Irish Potato Famine was caused by an airborne fungs called Phytophthora Infestans. This fungus came from the ships traveling from North America to England and was wafted on the Irish fields (mainly along the countryside of Dublin) by a fog. This made the leaves of the potato plants turn black and curled, before being rotted. This Irish Potato Famine has caused starvation to millions of people.