Editing River Thames (section)

===Sea level===
The sea level in the Thames estuary is rising and the rate of rise is increasing.<ref>{{cite web|url=https://www.southampton.ac.uk/news/2021/02/thames-estuary-changes.page|title=Thames Estuary report highlights changes over decade |publisher=Southampton University|access-date=13 August 2023|date=23 February 2021}}</ref><ref>{{cite web|url=https://www.gov.uk/government/news/thames-estuary-2100-time-to-plan-and-time-to-act|title=Thames Estuary 2100: Time to Plan and Time to Act |access-date=13 August 2023|date=17 May 2023|publisher=Environment Agency}}</ref>

Sediment cores up to 10 m deep collected by the [[British Geological Survey]] from the banks of the tidal River Thames contain geochemical information and fossils which provide a 10,000-year record of sea-level change.<ref name=" The application of δ13C, TOC, C/N geochemistry to reconstruct Holocene relative sea levels and paleoenvironments in the Thames Estuary, UK.">{{cite journal |url=http://nora.nerc.ac.uk/id/eprint/511378/1/ThamesGeochem_v10_.pdf |via=ResearchGate |title=The application of δ13C, TOC, C/N geochemistry to reconstruct Holocene relative sea levels and paleoenvironments in the Thames Estuary, UK. |last1=Khan |first1=S. N. |last2=Vane |first2=C. H. |last3=Horton |first3=B. P. |last4=Hillier |first4=C.| last5=Riding |first5=J. B. |last6=Kendrick |first6=C. |date=2015 |journal=Journal of Quaternary Science |doi=10.1002/jqs.2784 |volume=30 |issue=5 |pages=417–433 |bibcode=2015JQS....30..417K |s2cid=12143258 |s2cid-access=free |access-date=20 January 2019 |archive-date= |archive-url= |url-status=}}</ref> Combined, this and other studies suggest that the Thames sea-level has risen more than 30 m during the Holocene at a rate of around 5–6&nbsp;mm per year from 10,000 to 6,000 years ago.<ref name=" The application of δ13C, TOC, C/N geochemistry to reconstruct Holocene relative sea levels and paleoenvironments in the Thames Estuary, UK."/> The rise of sea level dramatically reduced when the ice melt nearly concluded{{clarify|date=August 2023}} over the past 4,000 years. Since the beginning of the 20th century, rates of sea level rise range from 1.22&nbsp;mm per year to 2.14&nbsp;mm per year.<ref name=" The application of δ13C, TOC, C/N geochemistry to reconstruct Holocene relative sea levels and paleoenvironments in the Thames Estuary, UK."/>