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 to access Heatmap’s expert analysis of energy, climate change, and sustainability, including coverage of our regular survey research. Save $57 on an annual subscription, just $156 $99/year.
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
Daily Briefing

The EPA’s Abdication

Under new rules, the United States will impose virtually no limits on greenhouse gas pollution from power plants.

Lee Zeldin.
Heatmap Illustration/Getty Images

This is an edition of Heatmap Daily, an evening review of the day’s news written by our executive editor. Sign up for it here.

Happy Monday. It’s going to be a big week. Let’s begin with the immediate news.

Keep reading...Show less
Politics

Americans Still Love the Environment

Heatmap’s latest poll adds urgency to one of the biggest questions facing the climate: Can the environmental movement come back?

An old photograph.
Heatmap Illustration/Getty Images

Three years ago, I wrote a piece for this website about how I’d stopped openly describing myself as an environmentalist. Looking back at it now, it’s a bit of a head-scratcher: I love nature, conservation, and all things outdoorsy, and while I stand by my greater point — that we can’t let uncompromising ideals about the environment hold back renewable energy development — the truth is, I am absolutely an environmentalist. But saying so felt analogous to calling myself tender-hearted, naïve, and retrograde.

The truth is, most Americans are environmentalists, at least if you take a wide definition. In new polling and focus group research conducted by Heatmap News and Embold Research, nearly three in four registered voters (72%) told us “the environment” is extremely or very important to them personally. The environment, in fact, ranked a full 17 points higher than “climate change” in a battery of potential voter issues, despite the latter’s much more obvious existential threat. Even among the subset of people we labeled “skeptics,” for whom climate change was of minimal to no importance, a third (32%) still told us the environment matters to them greatly.

Keep reading...Show less
Green
AM Briefing

Carbon Free-for-All

On refineries, Europeanizing Canada, and Australian uranium

The J.H. Campbell power plant.
Heatmap Illustration/Getty Images

Current conditions: The Atlantic set a record on Saturday for the longest stretch of the hurricane season since the advent of satellites without a major named storm • Argentina is bracing for severe Zonda winds, a type of intense downslope gust unique to the eastern side of the Andes Mountains • While the wildfires darkening skies over Indonesia have receded, blazes are still raging across the southern shores of Sumatra, Borneo, and West Papua.


THE TOP FIVE

1. EPA plans to repeal climate rules on power plants

The United States is preparing to eliminate any cap on the amount of planet-warming pollution from burning coal or gas that power plants can spew into the atmosphere. On Sunday night, The New York Times reported that the Environmental Protection Agency planned to announce a final repeal of climate rules on the power sector at this week’s summit in Houston of energy ministers from the Group of 20 nations. The EPA already moved to remove the entire legal basis for regulating greenhouse gases at any level by gutting its endangerment finding, which my colleagues Robinson Meyer and Emily Pontecorvo explained last winter. In March, as I told you at the time, almost half of all U.S. states sued to block the administration from rescinding the finding. The EPA went on to scrap standards on climate-heating emissions for car tailpipes and loosened rules on heat-trapping chemicals used in refrigerators and air conditioners. Under the new proposal, which the Times noted would come out Monday, power plants would still face limits on mercury, arsenic, and other contaminants, “though the EPA has already loosened restrictions on how much mercury they can emit.”

Keep reading...Show less
Blue