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Try Dashlane here: http://dashlane.com/simonclark Get 10% off now with my promo code: simonclark ! In this video I answer the question: 'isn't climate change supposed to have risen sea levels by now?' by looking at one dataset in some detail, and reviewing the scientific literature. Also: Kevin Costner's Waterworld. My video on stopping climate change: https://www.youtube.com/watch?v=GkbuV_a-rvs This video was light on the potential impacts of sea level rise. I wanted to focus specifically on the perception that sea levels have not changed, and spend time on the data. If you’re interested in the potential impacts then https://www.ipcc.ch/site/assets/uploads/2018/02/ar5_wgII_spm_en.pdf is a must read. Anthropogenic climate change (AGW) is a fickle bit of science, and like much of environmental science sometimes changes on (relatively) long timescales and global extent can hide in plain sight. That seems to be the case with sea level rise. The data is very clear: sea levels have been rising faster and faster over the past century, and this is not caused by natural variability. Humanity's carbon emissions are radiatively forcing the planet, causing net warming and so thermal expansion of the oceans and melting of ice sheets. It appears that this is going to become more and more painfully obvious as this century wears on, and so the sooner we take action the better. REFERENCES/FOOTNOTES (1) Church and White (2011) https://link.springer.com/article/10.1007/s10712-011-9119-1 (2) This figure from https://commons.wikimedia.org/wiki/File:Post-Glacial_Sea_Level.png, created by Robert Rohde based on data from Fleming et al. 1998, Fleming 2000, and Milne et al. 2005 (3) There are many excellent resources online about Milankovitch cycles. In this instance, the wiki is a good introduction: https://en.wikipedia.org/wiki/Milankovitch_cycles (4) Gross scale annual reconstruction of Greenland temperatures using data from Buizert et al (2018) https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2017GL075601. The enormous anomalous warming circa 15kya is the Bølling-Allerød interstadial, likely caused by changes in the AMOC https://en.wikipedia.org/wiki/B%C3%B8lling-Aller%C3%B8d_warming (5) This figure taken from https://www.arcgis.com/home/webmap/viewer.html?webmap=f1e7378b962d42168fdefec3b6eb8b5f (6) This rate calculated based on the year to year (backward step) finite difference gradient of annual average data from (1), averaged over 30 years. (7) See http://lasp.colorado.edu/home/sorce/data/tsi-data/. 100*(~1/1370) is less than 0.1%) (8) Current data https://scripps.ucsd.edu/programs/keelingcurve/. Yes, of course, this rise is caused by humans: https://scripps.ucsd.edu/programs/keelingcurve/2018/09/19/is-the-current-rise-in-co2-definitely-caused-by-human-activities/ (9) https://www.engineeringtoolbox.com/volumetric-temperature-expansion-d_315.html (10) IPCC AR5 WG1 chapter 13 https://www.ipcc.ch/site/assets/uploads/2018/02/WG1AR5_Chapter13_FINAL.pdf (11) Though sometimes the timeframe of long term predictions is unclear, e.g. https://www.nature.com/articles/271321a0, leading to hyperbolic interpretations. (12) This figure taken from https://blogs.egu.eu/divisions/gd/2017/09/13/modern-day-sea-level-rise/, which is a recommended read. (13) https://science2017.globalchange.gov/chapter/12/ (14) https://www.theguardian.com/environment/2016/jun/14/first-case-emerges-of-mammal-species-wiped-out-by-human-induced-climate-change ---------- II ---------- You can support the channel by donating at http://www.patreon.com/simonoxfphys Check out my website! https://www.simonoxfphys.com/ ---------- II ---------- My twitter - http://www.twitter.com/simonoxfphys My facebook - http://www.facebook.com/youtubesimon My insta - http://www.instagram.com/simonoxfphys My goodreads - http://www.goodreads.com/simonoxfphys ---------- II ---------- Music by Epidemic Sound: http://epidemicsound.com Stock footage provided by Bigstock: http://bit.ly/bigstock-videofreetrial Huge thanks to my supporters on Patreon: Alastair Fortune, Anne Smith, Ben McMurtry, bitreign33, Caitlin Louise, Charles Bray, Dan Hanvey, David Efird, Ethan Fuller, Filip Kermit Prick, James Bridges, jawad alalasi, Jay Wright, Jia Xin Peng, Jonathan Trimble, Julian Guggenberger, Kendall Hendrix, Kendra Johnson, Kodzo, Lachlan Woods, Leighton Mackenzie, Liam, Louis Gillet, Mark Anthony Magro, Martin Hermes, Mat Allen, Matthias Loos, Michael Phillips, Mike Wooldridge, Omar Miranda, Paul Everitt, Rory Healy, Ryke Allen, Scott Cassidy, Thusto, Tiarna Pepall, Tim Boxall, Wendover Productions
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