What if every page told you its own carbon cost? Web pages get heavier because nobody sees the weight. A new script here, a big image there. A number on every page keeps the team honest. Here is the fix you can use today. First, add the Green Web Foundation's carbon library to your pages. It estimates each page view's data size and carbon. Next, show the figure where your team, and your visitors, will see it. Then treat it like a performance budget. Tools like GreenFrame measure a web app's footprint, and enforce carbon budgets in testing. A heavier page is a bug to fix. GreenCode shows the data size and carbon of every page in its own website's footer. A change that makes a page heavier shows up straight away. GreenCode helps tackle this by keeping its own pages light, and showing the result. Its first-visit home page shrank from six point eight to one point seven megabytes. That was GreenCode Tech Tip number fifty. Follow for the next tip, and find more on greencode.ai/tech-tips.