In 800-1200 AD, the annual temperature in the North Atlantic region is now above 1 degree Celsius, corn planting becomes possible in Norway. However, in 1500-1800 AD, Western Europe appears in a Little Ice Age, average temperatures are only 1-2 degrees Celsius lower than today and cause half of Norwegian farms to abandon, Icelandic agricultural activities they are almost stopped. Furthermore, global warming will have negative effects on the stability and distribution of global food production (Effect of climate change on plants