Our current concepts of abrupt climate change are strongly influenced by compelling palaeoclimate evidence for events like the Younger Dryas, in which massive changes in climate occurred essentially instantaneously.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/identification-younger-dryas-outburst-flood-path-lake-agassiz-arctic-ocean
[2] http://admin.indiaenvironmentportal.org.in/category/author/julian-b-murton
[3] http://admin.indiaenvironmentportal.org.in/category/author/mark-d-bateman
[4] http://admin.indiaenvironmentportal.org.in/category/author/scott-r-dallimore-et-al
[5] http://admin.indiaenvironmentportal.org.in/category/journal/nature
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rivers
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/arctic-ocean
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/north-atlantic-ocean
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/canada
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-science
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/floods