Of all the potential global disasters that we periodically list and examine, only one has threatened repeatedly to become a reality: the flu, a variety of which is now spreading quickly across the world. A global flu epidemic seems a feeble threat compared to an asteroid impact or a nuclear holocaust, which nobody has encountered.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/return-mutants
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/business-world-kolkata
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/canada
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/viral-diseases
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/influenza
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/who
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/spain
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-kingdom-uk
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mexico
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-states-america-us
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/new-zealand