I built a carbon linter for Terraform PRs — here's the full stack

Most cloud sustainability tools are built for sustainability officers. They pull three-month-old billing data, run it through a proprietary model, and produce a PDF that engineers never see. By the time you know your us-east-1 cluster emits twice as much as us-west-2 would have, it's been running for a quarter. The architecture is locked in. The carbon is already burnt. The only moment you can actually change what gets deployed is the pull request. So I built a tool that lives there. What GreenO