Who said pollution only comes from exhaust pipes or smokestacks? As you read these lines, billions of data travel through submarine cables and server farms as large as football stadiums, consuming energy that we often ignore. It’s the paradox of our era: we believe that digital is ethereal, immaterial, and therefore ‘clean’, but the physical reality of the internet tells a different story. Every time we press ‘Send’, even for a short message like ‘Hello! Sending the article’, we activate a chain of energy consumption that, multiplied by the 4 billion active users worldwide, generates a carbon footprint comparable to that of the entire aviation industry.
According to the latest data from the French agency ADEME (Agency for Ecological Transition), sending a single email with a large attachment can emit up to 50 grams of CO2. Seems little? Multiply that by the approximately 300 billion emails exchanged worldwide every day. The result is staggering. The ‘Cloud’, where we store our photos and documents, is not made of vapor, but of silicon, rare metals, and, above all, electricity needed to power data centers and cool their overheated circuits 24 hours a day.
The weight of the invisible: the numbers of the digital carbon footprint
The digital sector is currently responsible for approximately 4% of global greenhouse gas emissions, a figure destined to double by 2025 if we do not change our habits. This is not about demonizing technology, which remains a fundamental tool for ecological transition, but about using it consciously. High-definition video streaming, for example, represents a huge slice of this consumption, as does the serial accumulation of data that we will never use. This is where the concept of Digital Cleanup comes into play.
Why should we worry about a brief courtesy email? Because redundancy is the enemy of efficiency. Sending fragmented messages, keeping thousands of unopened newsletters in memory, or saving duplicate photos in the cloud means occupying unnecessary server space. And server space means energy. A study showed that if every adult in the UK sent one fewer ‘Thank you’ email per day, over 16,000 tons of carbon would be saved annually, the equivalent of taking thousands of diesel cars off the road.
Practical solutions for a digital diet
The good news is that reducing your digital footprint is much simpler than giving up your car or changing your heating system. Here are some immediate actions we can take:
1. Clean up your inbox: Deleting old emails and unsubscribing from newsletters you don’t read frees up server space.
2. Use links instead of attachments: Instead of sending heavy files to multiple recipients, upload the file to a storage service and send only the link. This avoids duplicating the file on each recipient’s mail servers.
3. Turn off video in calls: If it’s not necessary to see each other, deactivating the camera during online meetings reduces data consumption (and therefore energy) by up to 96%.
4. Extend device life: The largest impact of digital technology (approximately 70%) comes from hardware production. Keeping a smartphone for 4 years instead of 2 halves its environmental impact.
Towards a future of ‘Digital Sobriety’
The future of sustainability also passes through our screens. Tech companies are beginning to invest in data centers powered by renewable energy and passive cooling systems (such as underwater ones or those located in Nordic countries), but technology alone is not enough. A cultural shift is needed. We must move from the idea of an ‘infinite and free’ internet to the awareness that every byte has a cost.
The next time you’re about to send an email or upload a file, ask yourself: is it really necessary? The green revolution also begins with a saved click. Adopting digital sobriety does not mean giving up progress, but making it compatible with the limits of our planet, ensuring that technology remains a resource and does not become an unsustainable burden for future generations.
