I forgot one: #envtech (history at the intersection of tech and environment). Sara B. Pritchard and I have a book on this (named, functionally, Technology and the Environment in History). https://www.press.jhu.edu/books/title/12452/technology-and-environment-history
Oh, I see #histodon #histodons is building momentum. Hello! My most recent book is an urban environmental history of New York City, edited with Steven H. Corey. https://upittpress.org/books/9780822946526/