https://tonic.vice.com/en_us/article/d7ezaq/what-would-happen-if-all-the-bees-died-tomorrow
http://www.toptenz.net/10-things-happen-bees-died.php
https://matteroftrust.org/4754/20-amazing-honey-bee-facts
https://www.scienceabc.com/nature/bee-extinction-means-end-humanity.html
https://www.theodysseyonline.com/3-things-happen-bees-extinct
http://www.news.ucsb.edu/2011/013070/nceas-working-group-produces-study-showing-how-vitamins-and-minerals-fruits-and
http://www.cottonmill.com/blog/can-we-live-without-cotton/
https://en.wikipedia.org/wiki/Rapeseed