Trees and shrubs grew in the Sahara between 120,000 and 45,000 years ago, suggesting wet spells may have helped early humans as they left Africa.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/wet-weather-put-early-humans-europes-doorstep
[2] http://admin.indiaenvironmentportal.org.in/category/author/jeff-hecht
[3] http://admin.indiaenvironmentportal.org.in/category/journal/new-scientist
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/deserts
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sahara
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/migration
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/research
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/africa
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/europe
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/netherlands