How to make buildings without harming the Earth

October 8, 2026

AI Summary

5 min read

How to make buildings without harming the Earth

Construction is responsible for roughly one-tenth of all global carbon emissions—about four times the aviation industry's share—along with a third of the world's waste and half of all raw materials extracted from the Earth. These numbers, as environmental engineer Will Arnold notes, are almost unknown to the general public: "most people have no idea of these numbers." His book Future Build argues that the technical solutions already exist; the real challenge is adoption.

The big five and why they're hooked

The five materials that dominate modern construction are concrete, steel, glass, aluminium, and bricks. They're durable, strong, and long-lasting, but producing them requires heating raw materials to between 1,000 and 1,600 degrees Celsius—temperatures comparable to the base of a space rocket. To reach those temperatures, the industry burns fossil fuels, and for some materials like concrete, the chemical reaction itself releases additional CO₂. Making cement, for instance, involves crushing limestone and feeding it into a kiln the size of a jumbo jet with a jet flame running through it, powered by pulverized coal. "Even if you replace the coal with something else," Arnold explains, "you're still left with half the problem" from the chemical reaction.

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What you'll learn

1 (01:50) **Introducing the Problem: Construction's Hidden Footprint** - Jason Goodger introduces the topic and guest Will Arnold, framing the conversation around the massive environmental impact of the built environment.
2 (04:30) **The "Big Five" Materials and Our Addiction to Them** - Arnold identifies concrete, steel, glass, aluminium, and bricks as the five materials that dominate the modern built world.
3 (07:16) **The Chemistry of Damage: Why Making Materials is So Polluting** - A detailed breakdown of the manufacturing process, showing why it is inherently carbon-intensive.
4 (10:32) **Proven Solutions Exist: The "Hydrogen Steel" Breakthrough** - Arnold pivots from the problem to the solution, arguing the technical challenge is already solved.
5 (12:43) **Looking Back to Move Forward: Stone, Timber, and Modern Techniques** - The conversation explores using ancient materials in a modern, high-tech way.
6 (17:34) **The Heavier Building Problem: How Cost Drives Waste** - Arnold explains a counter-intuitive trend: modern buildings are getting heavier and more wasteful due to economic pressures.
7 (19:40) **Actionable Design Fix: The Column Spacing Trap** - A specific, practical example of how simple design choices can slash material use and cost.

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Show Notes

Every built environment we spend our time in, our homes, offices, music venues or sports stadiums – is designed and constructed after hours of consideration about form and function. Oftentimes, less consideration is given to the impact this has on the health of the planet.

In this episode, we’re joined by Will Arnold, an environmentalist, engineer, and author, to talk about his latest book, Future Build – How Construction Can Heal Our Planet.

He breaks down the huge environmental impact the five most common materials we use to construct the buildings we spend our lives in have on our planet, tells us some of the ways we could be producing these materials more efficiently and using them more thoughtfully, and looks to a future in which we can construct buildings that are more in tune with the environments they’re built in.

Take your curiosity further with a subscription to BBC Science Focus magazine. Every issue is packed with fascinating insights into the science behind everyday life, the latest breakthroughs and expert analysis, delivered straight to your door. Receive an extra £5 when you subscribe using the code SF5OFF, (minimum spend £20, see full terms and conditions on our website).

https://www.ourmediashop.com/bbc-science-focus-magazine-pod30

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