Answer:
The Vikings left Greenland because in 1257, a volcano erupted far away from Greenland in Indonesia. It was one of the most powerful eruptions in the last seven thousand years. Scientists have used ash frozen in ice cores from this time period to study the eruption. Volcanic eruptions can affect climate by spewing sulfur into the air. This reflect sunlight back to space and prevents sunlight from reaching the Earth. Scientists believe this cooling effect had a global impact after the 1257 eruption. There was worldwide famine.
Step-by-step explanation:
It is in the source.