There is no cheap solution for concrete’s carbon emissions yet

Concrete is responsible for 5%+ of global CO2 emissions and it will get more expensive

Concrete is the gray glue that binds our cities and industries together. It makes tall buildings possible and foundations strong. It helps us bridge rivers and valleys and keeps wind turbines upright. We don’t have a replacement for it. It’s not going anywhere.

But it’s also one of the largest sources of CO2 emissions globally, with estimates ranging from 5% to 12% depending on the source. The common solutions today for emissions are just like putting a little hydrogen in a natural gas line, an inadequate response to the climate crisis.

So what can we do about it? Do we have actual solutions? What will they cost? When will they be in place?

The greenhouse gas emissions from concrete come from a couple of major things and a few minor things. Let’s deal with the minor ones first, because they have obvious solutions.