Sign In or Create an Account.

By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy

Podcast

Humanity’s Most Abundant Material Is a Huge Climate Problem

Inside episode 25 of Shift Key.

Cement production.
Heatmap Illustration/Getty Images

Jesse is on vacation until August, so this is a special, Rob-only summer episode of Shift Key.

The world uses about 30 billion tons of concrete every year — more than any other material except water. It is the most ubiquitous human-made substance in the global economy. It’s also a huge climate problem. Producing cement, which is the key ingredient in concrete, generates roughly 8% of global annual greenhouse gas emissions.

Cody Finke has a plan to change that. He is the chief executive officer and cofounder of Brimstone, a startup that says it can cheaply produce ordinary Portland cement — the kind used in construction worldwide — without carbon emissions. This week, Rob chats with Finke about why cement’s carbon emissions aren’t from fossil fuels, why there are fewer cement plants than you might think, and the all-important difference between cement and concrete.

This episode of Shift Key is hosted by Robinson Meyer, the founding executive editor of Heatmap.

Subscribe to “Shift Key” and find this episode on Apple Podcasts, Spotify, Amazon, or wherever you get your podcasts.

You can also add the show’s RSS feed to your podcast app to follow us directly.

Here is an excerpt from our conversation:

Robinson Meyer: Concrete is such an archetypal big machine problem in decarbonization. Because not only is it carbon intensive, but also — like car engines or like plane engines but, notably, unlike power plants — maybe like power plants — the technology to do it is extremely dispersed. There are hundreds of thousands of concrete plants around the world, and they all have to be replaced to decarbonize this process. It’s just a huge, huge scaling endeavor, and one that, forces you to reckon with the material implications of decarbonization in a way that, I think, it can often be easier to skip over or, just think, in the form of electricity: Oh, we can just drop new power plants in, we can build renewables. But that’s not how decarbonizing concrete will work.

Cody Finke: I would actually want to challenge that slightly.

Meyer: Perfect.

Finke: So, for many solutions, that’s the case because you’re absolutely right, there are hundreds of thousands of concrete plants. But there are not hundreds of thousands of cement plants. Cement is the binder in concrete, and for the listeners —

Meyer: Yeah, let’s actually do this because clearly I also don’t fully understand.

Finke: Concrete’s the building material. It is the most consumed material on the planet. We make 40 to 50 billion tons of it every year as humans. Concrete is sand, gravel, water, and cement — cement is the glue. Without cement, concrete would just be a pile of sand and gravel — a wet pile of sand and gravel. Cement is essential for turning that pile of sand and gravel into a pourable rock.

But cement is only about 10% of concrete — 10% to 20% — and it's made in large, centralized facilities that are located basically around big population centers. There are only 2,000 or 3,000 cement plants in the world. So it depends on your solution, right? If your solution is making a novel material, then it may require working at the concrete level, which can be good and bad. There’s a lot of those facilities, but they’re also a bit cheaper. There’s good and bad attributes of that.

But if you were to do something like what Brimstone is doing, which is making ordinary Portland cement, then what you have to do is replace those 2,000 or 3,000 cement plants, which is still a big number —

Meyer: It is still a big number, but actually not a very big number.

This episode of Shift Key is sponsored by …

Watershed’s climate data engine helps companies measure and reduce their emissions, turning the data they already have into an audit-ready carbon footprint backed by the latest climate science. Get the sustainability data you need in weeks, not months. Learn more at watershed.com.

As a global leader in PV and ESS solutions, Sungrow invests heavily in research and development, constantly pushing the boundaries of solar and battery inverter technology. Discover why Sungrow is the essential component of the clean energy transition by visiting sungrowpower.com.

Music for Shift Key is by Adam Kromelow.

Green

You’re out of free articles.

Subscribe today to experience Heatmap’s expert analysis 
of climate change, clean energy, and sustainability.
To continue reading
Create a free account or sign in to unlock more free articles.
or
Please enter an email address
By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy
AM Briefing

Belgian Nuclear Waffling

On Texas solar, Total’s deal, and Rivian’s revving

A Belgian nuclear plant.
Heatmap Illustration/Getty Images

Current conditions: The storms soaking the American South with as much as 10 inches of rain are tamping down the region’s wildfire risk • Cavite, the Philippine port city on a peninsula at the southern lip of Manila Bay, is facing its eighth straight day of temperatures nearing 110 degrees Fahrenheit • North Korean state media just issued a warning of a “severe” and “unusual” drought, killing off crops and threatening food shortages in the infamously famine-afflicted hermit kingdom.

THE TOP FIVE

1. Belgium cancels its nuclear phaseout and prepares to nationalize its reactors


A view of the Tihange 2 nuclear reactor, which permanently shut down in 2023. Dursun Aydemir/Anadolu Agency via Getty Images

Keep reading...Show less
Yellow
Podcast

Some Great News About the Global Electricity System

Rob chats with Ember’s Nicholas Fulghum about the think tank’s newest report.

Earth.
Heatmap Illustration/Getty Images

Here’s some good news: Clean power met all electricity demand growth last year for the first time since the COVID-19 pandemic. That’s according to a new report on global electricity trends from Ember, a U.K. think tank that tracks energy data from around the world. The new review suggests that solar and batteries are continuing to remake the global power system — and outcompeting gas and coal in some of the world’s fastest growing economies.

On this week’s episode of Shift Key, Rob is joined by Nicholas Fulghum, the lead author of Ember’s new report and an energy and climate data analyst at the think tank. They discuss why solar keeps breaking records, whether India’s energy development trajectory has changed, and how the Iran War could change this year’s numbers.

Keep reading...Show less
Green
Earth.
Heatmap Illustration/Getty Images

This transcript has been automatically generated.

Subscribe to “Shift Key” and find this episode on Apple Podcasts, Spotify, Amazon, or wherever you get your podcasts.

Keep reading...Show less
Green