Hi how are things? Today we're going to talk about something we see every day, but rarely think about. The buildings that surround us. They are one of the biggest contributors to climate change, even though we often overlook them . Beneath all that concrete and steel lies a carbon debt that we are only just beginning to understand. So let's break it down. Okay, to start, let's look at a number that is tremendous. Almost 40% of all the world's carbon emissions come from the construction industry. It's a huge number. An invisible giant that shapes our world and at the same time our climate. And if that 40% isn't enough to give us an idea of ​​the urgency, check out this projection. By 2050, the number of buildings in the world will double. To give you an idea, we are on track to build the equivalent of a new city of Paris every week. The scale is truly difficult to imagine. Okay, so in order to tackle the problem, we first have to understand it, right? We need to find out exactly where those emissions are coming from, because not all carbon is the same. When we talk about buildings, there are two main types and the difference between them is fundamental. On one hand we have operational carbon. That's easy to understand. It is the energy we use every day for heating, air conditioning, and lights. But the one that hides from us, the true invisible giant, is embedded carbon. It is the climate debt with which a building is born. It's the entire energy cost of manufacturing the materials, transporting them, and finally building. In other words, it's the carbon footprint of a building before a single person even turns on a light. And well, if we're going to talk about embedded carbon, it's impossible not to talk about the king of construction, the protagonist of this story, concrete, it is literally the foundation of our modern civilization, but its production has an immense cost to the planet. Let's think about this for a second. Yes. If the entire cement industry were a country, it would be the third largest emitter of carbon dioxide on the planet. We're not talking about just another industry. Its impact is on the scale of a global superpower. This analogy shows us the magnitude of the challenge that a single material represents. And why? What makes it so polluting? Well, the answer lies in pure chemistry. Making cement requires a process called decarbonation. Basically, limestone is heated to incredibly high temperatures, and that reaction releases into the atmosphere all the carbon dioxide that the rock had stored for millions of years. And this leads us to an equation that is both simple and extremely alarming. For every ton of cement we produce, we release approximately one ton of CO2. It is a one-to-one ratio that has shaped the profile of our cities over the last century. With all this on the table, the question is obvious, isn't it? Aren't we doomed to continue building a bleak future out of concrete? The good news, and this is where the story gets interesting, is that no, something is changing. Now, let's get to the hopeful part of this story. Innovation is not only changing the materials we use, but the very philosophy of what a building can and should be. It is , in truth, a much more optimistic view. And here comes the idea that changes everything. What if buildings, instead of being these giant chimneys that spew carbon, could become sponges, tools that absorb and store it? We are moving from seeing them as a problem to designing them as part of the solution. And make no mistake, this is not science fiction; it's already happening thanks to solutions like these. Cross-laminated timber (CLT) that allows us to build wooden skyscrapers, recycled concrete, which uses rubble to create new material, or bioclimatic architecture, which is basically designing buildings so well thought out, so intelligent, that they hardly use any energy. Okay, let's talk about wood for a moment. A tree is a perfect machine for capturing CO2 from the atmosphere. Well, when building with wood from sustainable forests like CLT, the carbon that the tree absorbed throughout its life is trapped in the building's structure. It's like putting that carbon in a safe for decades or even centuries. But as I was saying, the change is more profound. It's not just about replacing bricks with wood. It is an evolution in the way of thinking, an ethical evolution. It is about taking responsibility for the planet from the moment the first line of a plan is drawn. This is the question that should now define any project. Financial cost is no longer the only thing that matters. The most important question now is, what is the cost to the planet? It's a complete change in how we value what we build. And how do you answer such a big question? Well, with technology. First, a digital twin of the building is created on the computer. Then, with something called life cycle analysis , you can calculate its total environmental impact from beginning to end. And the best part is that this allows you to optimize the design, changing things to reduce your carbon footprint before laying a single brick in the real world. And here's the most important lesson, I think. A building's carbon footprint is not an accident or unavoidable collateral damage. It is the result of decisions made during the design phase. And if it's a design flaw, it means it can be corrected, it can be fixed with a better design. It's that simple and that powerful. So, at the end of the day, the conclusion is pretty clear, isn't it? Choosing sustainable materials and methods is no longer a pretty option, a luxury, or a matter of style to obtain a certificate. Given the scale of the challenge before us, it is simply the only viable path to building a habitable future on our planet.