Save the environment. Don't upgrade

"trading in your old smartphone for the newest model is the worst thing you could do. According to Apple’s own metrics,79 per cent of the phone’s lifecycle carbon emissions are released during production. Resisting the urge to own the latest iPhone won’t reverse emissions for the products hitting the shelves next week, but it will help to limit how many phones are made in the future."

https://www.euronews.com/green/2023/09/12/iphone-13-release-date-how-much-energy-will-you-save-by-not-buying-the-new-phone