Case Study:

CO2 Web Emissions Tracker

Project Website


  • Astro
  • Tailwind
  • GitHub Actions
  • Puppeteer

Built in ~72 hours, CO2 Web Emissions Tracker leverages a few core techniques and software packages to help generate and track estimated CO2 Emissions for a list of nearly 8,000 *.gov domains.


In an era where digital footprints are expanding at an unprecedented rate, the environmental impact of our online activities can no longer be an afterthought. Recognizing the urgent need to marry technology with sustainability, the CO2 Web Emissions Tracker project was born out of a commitment to bring transparency and awareness to the carbon emissions associated with website usage. By developing a simple yet powerful interface to display and track the carbon emissions of over 15,000 websites, this project aims to shed light on a less visible aspect of environmental impact, inspiring businesses and individuals alike to make more informed decisions about their digital presence.

The core inspiration for this endeavor was to bridge the gap between data and action. With the internet’s carbon footprint rapidly growing, understanding the specific contributions of website activities to overall emissions became imperative. The CO2 Web Emissions Tracker not only quantifies

these emissions but also highlights the potential for improvement, showcasing how green hosting and efficient web design can significantly reduce a website’s environmental impact. By making this data readily accessible and updated nightly, the project encourages a continuous dialogue on sustainable web practices and offers tangible metrics for progress.

Moreover, the decision to keep the CO2 Web Emissions Tracker open source aligns with a broader vision of collaborative innovation and shared responsibility. In providing the tools and data necessary for others to engage with and expand upon this work, the project fosters a community-driven approach to tackling climate change. It underscores the belief that collective action and transparency in our digital endeavors are vital steps towards a more sustainable future, where technology serves not only as a driver of convenience and efficiency but also as a steward of environmental well-being.