No. It's lipstick on a pig, it's a way of feeling important while making no difference. The way you combat climate change is by reducing carbon dioxide output and increasing biomass creation and therefore uptake and sinking. You can't write code that does that. Adding complexity to everything is what software developers do best, only the most skilled ones manage to reduce complexity, and adding complexity to this sit…
Well you could be efficient with your code so it doesn't waste CPU cycles, since CPU cycles == Energy, and if your algorithms use less energy, in all likelihood you'll emit less CO2. Specially if they're widely deployed.
Well we gave developers that job and they failed miserably. We have orders of magnitude more compute and orders of magnitude more bandwidth and things are getting slower. If developers were going to solve that problem they would've done it already.