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1<meta name="next-size-adjust" content=""/><title>GreenChat</title><meta name="description" content="GreenChat is a browser extension that estimates CO2 emissions of ChatGPT conversations to raise awareness about the environmental impact of AI."/><meta name="google-site-verification" content="TT5Yn-TEiPFBQDhAqDA2NlcGY0GlBro-e50C1FF3H7E"/><link rel="icon" href="/favicon.ico?favicon.bc1e8212.ico" sizes="48x48" type="image/x-icon"/>
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1</head><body class="flex h-full flex-col"><div hidden=""><!--$--><!--/$--></div><header class="py-10"><div class="mx-auto max-w-7xl px-4 sm:px-6 lg:px-8"><nav class="relative z-50 flex justify-between"><div class="flex items-center md:gap-x-12"><a aria-label="Home" href="#"><div class="flex gap-2 justify-center items-center h-10 w-auto"><img alt="GreenChat" loading="lazy" width="386" height="332" decoding="async" data-nimg="1" class="h-10 w-auto" style="color:transparent" srcSet="/_next/image?url=%2F_next%2Fstatic%2Fmedia%2Flogo.cf4f4af7.png&amp;w=640&amp;q=75 1x, /_next/image?url=%2F_next%2Fstatic%2Fmedia%2Flogo.cf4f4af7.png&amp;w=828&amp;q=75 2x" src="/_next/image?url=%2F_next%2Fstatic%2Fmedia%2Flogo.cf4f4af7.png&amp;w=828&amp;q=75"/><h1 class="text-2xl font-semibold text-green">GreenChat</h1></div></a></div><div class="flex items-center gap-x-5 md:gap-x-8"><div class="hidden md:block"><a class="group inline-flex ring-1 items-center justify-center rounded-full py-2 px-4 text-sm focus:outline-hidden ring-slate-200 text-slate-700 hover:text-slate-900 hover:ring-slate-300 active:bg-slate-100 active:text-slate-600 focus-visible:outline-lime-600 focus-visible:ring-slate-300" color="slate" variant="outline" rel="noopener noreferrer" target="_blank" href="https://github.com/simonbiennier/greenchat">Source code</a></div><a class="group inline-flex items-center justify-center rounded-full py-2 px-4 text-sm font-semibold focus:outline-hidden focus-visible:outline-2 focus-visible:outline-offset-2 bg-slate-900 text-white hover:bg-slate-700 hover:text-slate-100 active:bg-slate-800 active:text-slate-300 focus-visible:outline-slate-900" color="slate" rel="noopener noreferrer" target="_blank" variant="solid" href="https://chromewebstore.google.com/detail/greenchat/ndpiijjfeonckaejbemcbhanmapdpopm">Download for ChatGPT (Chrome)</a><a class="group inline-flex items-center justify-center rounded-full py-2 px-4 text-sm font-semibold focus:outline-hidden focus-visible:outline-2 focus-visible:outline-offset-2 bg-slate-900 text-white hover:bg-slate-700 hover:text-slate-100 active:bg-slate-800 active:text-slate-300 focus-visible:outline-slate-900" color="slate" rel="noopener noreferrer" target="_blank" variant="solid" href="https://microsoftedge.microsoft.com/addons/detail/greenchat-copilot/nlkcbigjdpbhnigcemdneijcindalfao">Download for Copilot (Edge)</a></div></nav></div></header><main><div class="mx-auto max-w-7xl px-4 sm:px-6 lg:px-8 pt-20 pb-16 text-center lg:pt-32"><h1 class="mx-auto max-w-4xl font-display text-5xl font-medium tracking-tight text-slate-900 sm:text-7xl">It&#x27;s time to think<!-- --> <span class="relative whitespace-nowrap text-green"><svg aria-hidden="true" class="absolute top-2/3 left-0 h-[0.58em] w-full fill-lime-200/70" preserveAspectRatio="none" viewBox="0 0 418 42"><path d="M203.371.916c-26.013-2.078-76.686 1.963-124.73 9.946L67.3 12.749C35.421 18.062 18.2 21.766 6.004 25.934 1.244 27.561.828 27.778.874 28.61c.07 1.214.828 1.121 9.595-1.176 9.072-2.377 17.15-3.92 39.246-7.496C123.565 7.986 157.869 4.492 195.942 5.046c7.461.108 19.25 1.696 19.17 2.582-.107 1.183-7.874 4.31-25.75 10.366-21.992 7.45-35.43 12.534-36.701 13.884-2.173 2.308-.202 4.407 4.442 4.734 2.654.187 3.263.157 15.593-.78 35.401-2.686 57.944-3.488 88.365-3.143 46.327.526 75.721 2.23 130.788 7.584 19.787 1.924 20.814 1.98 24.557 1.332l.066-.011c1.201-.203 1.53-1.825.399-2.335-2.911-1.31-4.893-1.604-22.048-3.261-57.509-5.556-87.871-7.36-132.059-7.842-23.239-.254-33.617-.116-50.627.674-11.629.54-42.371 2.494-46.696 2.967-2.359.259 8.133-3.625 26.504-9.81 23.239-7.825 27.934-10.149 28.304-14.005.417-4.348-3.529-6-16.878-7.066Z"></path></svg><span class="relative">green.</span></span></h1><p class="mx-auto mt-6 max-w-2xl text-lg tracking-tight text-slate-700">GreenChat is a browser extension that estimates CO2 emissions of assistant conversations to raise awareness about the environmental impact of AI.</p></div><section aria-label="Features for simplifying everyday business tasks" class="pt-20 pb-14 sm:pt-32 sm:pb-20 lg:pb-32" id="how-its-calculated"><div class="mx-auto max-w-7xl px-4 sm:px-6 lg:px-8"><div class="mx-auto max-w-2xl md:text-center"><h2 class="font-display text-3xl tracking-tight text-slate-900 sm:text-4xl">Here&#x27;
1s how we calculate it.</h2><p class="mt-4 text-lg tracking-tight text-slate-700">Estimating carbon footprint of AI models is challenging due to their closed-source policy. However, studies suggest energy consumption per query ranges from<strong> 0.3 to 3 watt-hours</strong>. According to<!-- --> <a class="text-lime-600" href="https://www.sciencedirect.com/science/article/pii/S2542435123003653" rel="noopener noreferrer" target="_blank">Alex De Vries</a>, a typical query uses around 3 watt-hours, while<!-- --> <a class="text-lime-600" href="https://epoch.ai/gradient-updates/how-much-energy-does-chatgpt-use" rel="noopener noreferrer" target="_blank">Josh You</a> <!-- -->argues that shorter queries use just 0.3 watt-hours, similar to a Google search.</p><p class="mt-4 text-lg tracking-tight text-slate-700">The carbon emissions depend on data center energy sources. The U.S. average carbon intensity is<!-- --> <a class="text-lime-600" href="https://arxiv.org/abs/2104.10350" rel="noopener noreferrer" target="_blank">0.429 kg CO₂e/kWh</a>, meaning emissions per query range between<!-- --> <!-- --> <strong>0.1287g and 1.287g CO<sub>2</sub>e</strong>. Per token, estimates vary from<!-- --> <strong>0.2145 mg to 0.2574 mg CO<sub>2</sub>e</strong>, based on token length assumptions by De Vries and You.</p><p class="mt-4 text-lg tracking-tight text-slate-700">Water usage is another factor. According to<!-- --> <a class="text-lime-600" href="https://airatwork.com/wp-content/uploads/The-Green-Grid-White-Paper-35-WUE-Usage-Guidelines.pdf" rel="noopener noreferrer" target="_blank">The Green Grid</a>, U.S. data centers have an average water usage efficiency (WUE) of 1.8 L/kWh. Based on energy estimates, water consumption per token ranges from<!-- --> <!-- --> <strong>0.0001 to 0.0009 mL</strong>.</p></div></div></section><section aria-labelledby="faq-title" class="relative overflow-hidden bg-slate-50 py-20 sm:py-32" id="faq"><div class="mx-auto max-w-7xl px-4 sm:px-6 lg:px-8 relative"><div class="mx-auto max-w-2xl lg:mx-0"><h2 class="font-display text-3xl tracking-tight text-slate-900 sm:text-4xl" id="faq-title">Frequently asked questions</h2></div><ul class="mx-auto mt-16 grid max-w-2xl grid-cols-1 gap-8 lg:max-w-none lg:grid-cols-3" role="list"><li><ul class="flex flex-col gap-y-8" role="list"><li><h3 class="font-display text-lg/7 text-slate-900">Is the extension free?</h3><p class="mt-4 text-sm text-slate-700">Yes.</p></li><li><h3 class="font-display text-lg/7 text-slate-900">Where can I download this extension?</h3><p class="mt-4 text-sm text-slate-700">Click the download link at the top.</p></li><li><h3 class="font-display text-lg/7 text-slate-900">What tools were used to build GreenChat?</h3><p class="mt-4 text-sm text-slate-700">It uses React, Tailwind and Typescript among others for the extension and Next.js for the website.</p></li></ul></li><li><ul class="flex flex-col gap-y-8" role="list"><li><h3 class="font-display text-lg/7 text-slate-900">Does GreenChat track my conversations?</h3><p class="mt-4 text-sm text-slate-700">No, GreenChat does not store or send any conversation data. It only processes text locally to estimate emissions.</p></li><li><h3 class="font-display text-lg/7 text-slate-900">How accurate are GreenChat&#x27;s estimates?</h3><p class="mt-4 text-sm text-slate-700">Since AI models do not disclose energy usage details, GreenChat relies on third-party research and averages. The estimates are approximations meant to provide awareness, not exact measurements.</p></li></ul></li><li><ul class="flex flex-col gap-y-8" role="list"><li><h3 class="font-display text-lg/7 text-slate-900">Does GreenChat work with other AI models?</h3><p class="mt-4 text-sm text-slate-700">Currently, GreenChat is available for ChatGPT (on the Chrome Web Store) and Copilot (on the Edge store), but future updates may support other AI or browser platforms.</p></li><li><h3 class="font-display text-lg/7 text-slate-900">Is GreenChat safe to use?</h3><p class="mt-4 text-sm text-slate-700">Yes.</p></li></ul></li></ul></div></section></main><footer class="bg-slate-50"><div class="mx-auto max-w-7xl px-4 sm:px-6 lg:px-8"><div class="flex flex-col items-center border-t border-slate-400/10 py-10 sm:flex-row-reverse sm:justify-between"><div class="flex gap-x-6"><a aria-label="GreenChat on GitHub" class="group" rel="noopener noreferrer" target="_blank" href="https://github.com/simonbiennier/greenchat"><svg aria-hidden="true" class="h-6 w-6 fill-slate-500 group-hover:fill-slate-700" viewB
1ox="0 0 24 24"><path d="M12 2C6.477 2 2 6.484 2 12.017c0 4.425 2.865 8.18 6.839 9.504.5.092.682-.217.682-.483 0-.237-.008-.868-.013-1.703-2.782.605-3.369-1.343-3.369-1.343-.454-1.158-1.11-1.466-1.11-1.466-.908-.62.069-.608.069-.608 1.003.07 1.531 1.032 1.531 1.032.892 1.53 2.341 1.088 2.91.832.092-.647.35-1.088.636-1.338-2.22-.253-4.555-1.113-4.555-4.951 0-1.093.39-1.988 1.029-2.688-.103-.253-.446-1.272.098-2.65 0 0 .84-.27 2.75 1.026A9.564 9.564 0 0 1 12 6.844a9.59 9.59 0 0 1 2.504.337c1.909-1.296 2.747-1.027 2.747-1.027.546 1.379.202 2.398.1 2.651.64.7 1.028 1.595 1.028 2.688 0 3.848-2.339 4.695-4.566 4.943.359.309.678.92.678 1.855 0 1.338-.012 2.419-.012 2.747 0 .268.18.58.688.482A10.02 10.02 0 0 0 22 12.017C22 6.484 17.522 2 12 2Z"></path></svg></a></div><p class="mt-6 text-sm text-slate-500 sm:mt-0">Copyright ©<!-- --> <!-- -->2026<!-- --> <!-- -->GreenChat. All rights reserved.</p></div></div></footer><!--$--><!--/$-->
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