The Green Web Foundation provides an open-source library designed to estimate the carbon emissions of websites: https://www.thegreenwebfoundation.org/. This library is lightweight, easy to implement, and shows strong potential for integration into digital tools.
One promising application would be a tool that offers real-time emissions feedback within content management systems. By integrating carbon insights directly into the content editing interface, web editors could actively reduce emissions as they create and update content.
Although a WordPress plugin already exists based on this library (https://wordpress.org/plugins/website-carbon-calculator/), it was tested on two different WordPress installations and failed to function as expected. This indicates an opportunity to develop a more reliable, user-friendly solution.