Imagine if every time you unlocked your phone, a small puff of smoke curled up into the air above you. Embarrassing at brunch. Alarming on the subway. A little hard to ignore, right? That thought experiment, posed at SXSW by designers from London-based digital agency Tangent, gets at something most of us have never really sat with: our digital lives have a very real carbon cost, even if we can't see it.
The invisible infrastructure around us
Over the last two decades, the internet has quietly become the backbone of modern society. More than 60% of the world's population is now online, and that connectivity comes with a price tag measured not just in dollars, but in emissions. According to reporting by Fast Company, the average internet user generates around 229 kilograms of carbon per year just through their online activity. Multiply that by billions of users and the numbers get uncomfortable fast.
The issue is that digital consumption doesn't feel like consumption. Streaming a show, sending a voice note, refreshing your feed - none of it carries the obvious weight of, say, driving a car or flying somewhere. There's no exhaust pipe. No smell. No tangible transaction between you and the planet. That invisibility is exactly what makes it so easy to ignore.
Why this is worth paying attention to now
The digital ecosystem isn't slowing down - it's accelerating. AI tools, higher-resolution video, always-on apps, and expanding global connectivity all add to the load on data centers and networks that run on enormous amounts of energy. The infrastructure quietly humming away behind every click is growing, and so is its footprint.
That doesn't mean the answer is to log off forever. But it does mean that the conversation about sustainable living needs to expand beyond reusable bags and electric cars. Our digital habits are part of the picture too - and right now, most of us aren't even thinking about them.
Small awareness, bigger picture
The smoke-puff thought experiment works because it makes something abstract feel immediate and personal. We respond to things we can see and feel. The challenge with digital carbon is bridging that gap between invisible impact and real-world consequence.
Designers, tech companies, and policymakers are starting to grapple with this. But so can the rest of us - simply by starting to ask the question. What does it actually cost the planet when we're online? The answer is more interesting, and more important, than most of us have been led to believe.
