Every website on the internet is hosted on a server, and most of the world’s servers are powered by fossil fuels.

In fact, if the internet was a country it would be the world’s fourth biggest polluter1.

We need to do better.

MEK is pleased to present a pioneering case study in reducing website carbon emissions in an effort to inspire others; help fellow designers, studios and agencies create low emission websites for themselves and as a new service for clients looking to reduce their impact; and to help businesses transition to sustainable digital practices. This first of its kind project was a Finalist in Digital Design in the 2023 Victorian Premier’s Design Awards.

In late 2022 we went to a trivia night and one of the questions was “What has a bigger carbon footprint: sending 100 emails or driving 1km in a car?”

We answered “Driving 1km in a car”, because duh.

Well, we were wrong.

Since learning this startling fact (and losing yet another round of trivia), we wondered what the carbon footprint of our email usage was. We went through all our folders and deleted every email we didn’t need or weren’t actively engaged in conversation with.

Before we knew it we’d delved deep into the world of digital landfill, and like a Choose Your Own Adventure book we had two options:

1. Turn back
2. Do a complete audit

We couldn’t unknow what we learned, so we started researching resources that would help calculate our emissions.

These are our findings:

According to the Website Carbon Calculator, our old website produced more carbon than 76.5% of web pages tested. Over one year with ±10,000 monthly page views, it produced:

• 145.6kg of CO2 equivalent: the same weight as a piano and as much CO2 as boiling water for 19,728 cups of tea

• The same amount of carbon that 7 trees absorb in one year

• 329kWh of energy

• The same amount of electricity to drive an electric car 2,108km

This was incredibly alarming and we knew we had to create a new site asap. We started this process by auditing our old website.



We revisited the old site’s code and noticed there were too many unnecessary HTML tags that had duplicated over time. This resulted in a high volume of requests sent to the server, impacting the overall site speed and user experience as well as being more energy intensive:

Old website code


Our new site’s code is clean with no unnecessary or duplicated HTML tags. The site runs faster and smoother.



We used Monument Grotesk for the old site’s typography, with different fonts: Regular, Medium, Italic. We’d changed this to the variable version so that one font file contained the same number of stylistic variations, instead of three separate font files for Regular, Medium, Italic. This was to further reduce the number of HTTP requests, but we found it wasn’t enough.

Old website font: Monument Grotesk Regular


• Primary font: Arial Regular (this one)

This is a system font already installed on your device(s), thus reducing HTTP requests and in turn, energy.  

• The MEK wordmark appears as text-only on the site instead of a web font or image file. Our logo symbol only appears in the site’s favicon, the little icon on your browser tab.



We used a versatile colour system of vibrant and neutral colours throughout the old site. The background was white to showcase our design work with clean, breathable pages that communicated copy and images effectively, however white light is the most energy intensive because it comprises all the colours in the colour spectrum.

Old website colour palette


• Dark mode with a surface colour of #121212
• White text at 87% opacity
• Disabled text at 38% opacity
• The contrast ratio of pink is 7:1

All colours, ratios and opacities adhere to Google’s Material Design and pass the Web Content Accessibility Guidelines (WCAG) and Colour Contrast Checker.

The new site is in dark mode which is new for us because we’ve always had light mode websites with beautiful bold colour. From a user experience perspective, dark mode is more visually appealing, and it also reduces eye strain (we haven’t found any scientific data on this so if you know of any please let us know).

We used pink because blue is ubiquitous in dark mode palettes and energy intensive. Pink is Mek’s secondary brand colour and unique to us. Its use is uncommon for brands in our industry and the advocacy space.

New website colour palette



The images on our old site were high resolution JPGs with an average file size of ~700KB. These files impacted speed and significantly increased energy usage and emissions.


Images on our new site are <500KB, optimised and compressed to minimise file handling times. Lazy loading is implemented, which means images only load when you scroll down to them.



The first thing we noticed on our old site that was energy intensive was our homepage, which had a looped slideshow of seven full screen images ranging from 114KB to 798KB. This drastically increased the site’s speed and load time resulting in high bounce rates. The old site also included various media such as reels, videos and animations, at an average of ~8MB per file.

Old website homepage image (part of a slideshow)


The new site only has static images that aren’t displayed at full size in order to further minimise loading. Not having big beautiful media and content with a dynamic palette and layout pains us as designers, but we think we did a pretty good job making this site as ‘designery’ as possible within the limited constraints we had to work with.



Old website layout (part of a slideshow)

• The new layout is clear and easy to follow, reducing your number of clicks and allowing greater accessibility of content.

• Navigation is simplified and clearly described to make information easy to find.

• While the site design is restrained and functional, it relies on strong typography to ensure visual interest and user engagement, minimise lengthy copy, and divide sections of content into digestible forms.


After launching this site in March 2023 we ran it through the Website Carbon Calculator again:


• Dirtier than 76.5% of web pages tested
• Produced 1.21g of CO2 every time someone visited


• Cleaner than 57% of web pages tested
• Produces only 0.42g of CO2 every time someone visits


• Produced 145.6kg of CO2 equivalent: the same weight as a piano and as much CO2 as boiling water for 19,728 cups of tea


• Produces 50.5kg of CO2 equivalent: the same weight as <1⁄3 of a piano and as much CO2 as boiling water for 6,850 cups of tea


• Produced the same amount of carbon that 7 trees absorb in one year


• Produces the same amount of carbon that 3 trees absorb in one year


• Produced the same amount of electricity to drive an electric car 2,108km


• Produces the same amount of electricity to drive an electric car 732km

Overall we reduced our website carbon emissions by 67%.


Other things we’ve identified to reduce our emissions are switching to a green host, further reducing file sizes, and planting more trees to offset CO2.

So our next steps are:

1. Moving to a green web host. By using green hosting our site will emit ~9% less CO2. Green hosts use clean, renewable energy instead of fossil fuels.

2. Mek plants 10 trees through Carbon Positive Australia for every client we work with. We have increased this to 20 trees to further reduce our emissions.

3. Using WebP instead of JPG will reduce the size of our images thus emissions. We tested this by converting our JPGs to WebP — there was an average of ~70kb reduction per file, however our current platform doesn’t support WebP file uploads at this time. This will be a priority when we move to a green host. WebP is a file format developed by Google to reduce image file sizes.

4. We’ll continue looking for more ways to improve this site and reduce our digital impact. If you have any tips or suggestions, or any questions about this case study, please email hi@mek.studio.

Thanks for reading!

“MEK’s research played an important role in redefining our understanding of environmentally conscious design principles for the digital space. As we took on the challenge of crafting a brand for a non-profit client focused on combating climate change, the insights we discovered within MEK’s research provided a solid foundation for our exploration, prompting us to dig deeper into our own creative process. Thank you MEK team.”


“MEK’s case study on their own digital impact was refreshing. They’re the first studio I’ve seen that expressed a conscious and public redesign that considered its energy consumption. What was once totally ignored or considered a design constraint is now being celebrated as an opportunity to do better — energising me to do the same.”



Website Carbon Calculator
Google Material Design
Web Content Accessibility Guidelines
Colour Contrast Checker
Sustainable Digital Design
1Sustainable Web Manifesto
The Green Web Foundation
JPG to WebP Converter
How to Build a Low-Tech Website

Make Your Website More Energy Efficient

© MEK STUDIO® 2023–24. All rights reserved.

While this project was created to provide guidance and information for anyone to use, the case study, its content or its format may not be reproduced, rewritten, distributed, or transmitted, in whole or in part, without the prior written permission of MEK STUDIO®.

Any mention or reference of this project in digital or printed material must be credited to MEK STUDIO® with a direct link to this page.

For permission requests, please contact sarah@mek.studio.

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