I'm celebrating a mini win.
by monitoring my website's co2e emissions I discovered some issues and actions to take.
The bigest positive impact was to add the loading="lazy" #html attribute. It has 92% browser support, and graceful fallback.
Similarly srcset was an easy win. It helps browsers know which is is the best size image to download from a cdn/server.
I got an initial page size down from 5MB to 1.6MB.
BTW if you use #nextjs then next/image will assist with these attrs