The present-day Sahara Desert was previously a lush green region redundant with wildlife, savannah and swampland owing to a prehistoric climate change in the eastern Sahara, according to an in-depth archaeological study that highlights this theory.
Original Source [2]
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/phenomenon-green-sahara
[2] http://www.currentscience.ac.in/Downloads/article_id_095_09_1114_1114_0.pdf
[3] http://admin.indiaenvironmentportal.org.in/category/author/neelam-pereira
[4] http://admin.indiaenvironmentportal.org.in/category/journal/current-science
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/deserts
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sahara
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/desert-spread
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-science
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global-warming
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/africa
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rainfall