But, in about the year 900AD Europeans thrived by growing grain and vegetables on Greenland's southern shore. They disappeared when the climate got colder.
long, dark winters when the sun shines for as little as five hours a day.
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If this line is any indication I would not trust anything in this article. I was stationed for a year at Keflavik Iceland which is South of Greenland and during late December and early January there was no sun shine, only a short period of twilight at mid day. I don't think there is anything like five hours of sunlight in Greenland on the shortest days. I doubt that we have as much as nine hours in South Carolina during the shortest days.