I am serious about reducing carbon waste. I was amazed at how quickly that CO2e estimate jumps just by savings a few megabytes here and there.
At the very least, it's got me (and hopefully others!) thinking about the issue and I'll be doing everything I can to reduce the load (and the load time!) in the near future!
But if you're serious about reducing carbon waste, don't make visitors download 7.5MB to load the webpage.