Sperm count in Western countries has been dropping for over a hundred years, and scientists have some ideas as to what’s behind this swimmer shortage. Hosted by: Michael Aranda SciShow has a spinoff podcast! It’s called SciShow Tangents. Check it out at https://www.scishowtangents.org ———- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ———- Dooblydoo thanks go to the following Patreon supporters: Alex Hackman, Andrew Finley Brenan, Lazarus G, Sam Lutfi, D.A. Noe, الخليفي سلطان, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Patrick D. Ashmore, charles george, Kevin Bealer, Chris Peters ———- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ———- Sources: https://academic.oup.com/humupd/article-abstract/23/6/646/4035689?redirectedFrom=fulltext https://www.ucsf.edu/news/2007/03/5541/hot-tubs-hurt-fertility-ucsf-study-shows https://academic.oup.com/humupd/article/19/3/221/725245 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3521747 https://onlinelibrary.wiley.com/doi/abs/10.1111/obr.12282 https://onlinelibrary.wiley.com/doi/abs/10.2164/jandrol.05193 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5034728/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3881654/ https://www.sciencedirect.com/science/article/pii/S1472648315003776 https://www.nature.com/articles/s41598-018-25950-3#ref-CR12 https://www.ncbi.nlm.nih.gov/pubmed/9112368 https://academic.oup.com/humrep/article/16/8/1768/624705 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2078473/#!po=7.14286 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2775531/ https://www.ncbi.nlm.nih.gov/pubmed/20053623 https://academic.oup.com/humupd/article/20/2/231/664157 https://www.ncbi.nlm.nih.gov/pubmed/26087406 https://www.ncbi.nlm.nih.gov/pubmed/26601918 https://www.sciencedirect.com/science/article/pii/S0269749115301457 https://news.harvard.edu/gazette/story/2015/03/pesticides-result-in-lower-sperm-counts/ https://www.fertstert.org/article/S0015-0282(16)59640-X/pdf https://pdfs.semanticscholar.org/831d/6d5ae4700609b49fb75b213f4145866da976.pdf https://www.researchgate.net/publication/318702383_The_Impact_of_Climate_Change_On_Sperm_Quality_and_Quantity_A_Public_Health_Concern http://www.nber.org/papers/w21681.pdf http://newsroom.ucla.edu/releases/climate-change-making-it-harder-to-conceive