Detailed studies of ancient climate have revealed that the onset of Europe's "Big Freeze", 13,000 years ago, was anything but glacial.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/mini-ice-age-took-hold-europe-months
[2] http://admin.indiaenvironmentportal.org.in/category/author/kate-ravilious
[3] http://admin.indiaenvironmentportal.org.in/category/journal/new-scientist
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/arctic-ocean
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/north-atlantic-ocean
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-science
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/n-c-america
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/european-union-eu