>>2835651
Plant new ones, regardless of where you live. Introduce them to Europe and Asia, they are surprisingly hardy, and were actually native there around the last Ice Age. Don't let them go extinct.
https://www.youtube.com/watch?v=38p2NyV8pYo
https://news.sky.com/story/more-giant-redwoods-in-uk-than-in-native-us-study-says-13093742