References to the impacts of humans, 9 Boundaries, climate change, London smog and PFAS chemicals.

 The impact of ancient people on the environment https://www.abc.net.au/news/science/2019-08-30/ancient-civilisations-environmental-impact/11450072

 Science 365, 897–902 (2019) 30 August 2019 Archaeological assessment reveals Earth’s early transformation through land use

 World population https://www.worldometers.info/world-population/world-population-by-year/

Wheat

https://www.nytimes.com/1975/07/25/archives/another-million-tons-of-wheat-bought-by-soviet-from-canada-canadian.html#:~:text=Wheat%20Outlook%20Revised,million%20to%2010%20million%20tons

World wheatt production data from USDA.

9 Planetary Boundary conditions identified

https://www.stockholmresilience.org/research/research-news/2023-09-13-all-planetary-boundaries-mapped-out-for-the-first-time-six-of-nine-crossed.html

ABC (Australian Broadcasting) and the Pacific Islands https://www.abc.net.au/news/2024-09-26/sea-levels-will-rise-new-research-nasa/104400114

 Air conditioning

The Economist September 7th 2024 _Chilling prospects_ pp39-40

 London Smog of 1952 (BBC) https://www.youtube.com/watch?v=90kq35cWZz4

 PFAS chemicals https://www.abc.net.au/news/health/2024-10-21/new-safe-pfas-drinking-water-guidelines/104497226