Building Green Software by Anne Currie, Sarah Hsu and Sara Bergman, published by O'Reilly, is available here under a CC BY-NC-ND Creative Commons license i.e. you can read it and quote it for non commercial purposes as long as you attribute the source (O'Reilly's book) and don't use it to produce derivative works.
You can buy the book from good bookstores including Amazon in all regions (currently on offer in the UK). or read it on the O'Reilly site if you are an O'Reilly subscriber.
Chapters:
3: Code Efficiency
4: Operational Efficiency
5: Carbon Awareness
6: Hardware Efficiency
7: Networking
8: AI and LLMs
9: Measurement
10: Monitoring
11: Co-benefits
13: Where Do We Go From Here?