Observant aliens visiting Earth and studying its civilizations would probably be pretty obsessed with wheat.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/troubling-new-research-suggests-global-warming-will-cut-wheat-yields
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/washington-post
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-impacts
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/agriculture
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/food-crops
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wheat
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/food-security
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global-warming