@simon As a first and very accurate approximation, "carbon footprint" is whatever you pay for something.
The best way to reduce your environmental impact is to spend less money.
@simon It's almost hard to believe "green" distractions like this aren't intended to prevent more effective actions (e.g. spending less money).
Also worth noting that Google Gemini is probably 80% more efficient: https://venturebeat.com/ai/the-new-ai-calculus-googles-80-cost-edge-vs-openais-ecosystem/