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Can we reverse the negative environmental impact of cement production? – Energy Central

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If cement were a country, it would be the third largest emitter of carbon dioxide in the world.
But the world can’t live without cement so what’s the answer? One company thinks they know. And Bill Gates’ Breakthrough Energy Ventures and Amazon’s Climate Pledge are helping to fund the effort.
California-based Brimstone believe they have developed the world’s first carbon-negative cement.
How?
By changing the raw material used from limestone to calcium silicate rocks. Limestone contains calcium, the binding agent in cement. Unfortunately, it also contains carbon dioxide and when it’s superheated to 2,700 degree, the carbon is released. Calcium silicate rocks contain no embedded carbon dioxide. Better yet, it’s 200 times more abundant than limestone.
It sounds like a simple solution, but the change in raw material requires a manufacturing process change and that’s where Brimstone’s patented process technology comes into play. To date, it doesn’t appear that they have proven the approach at scale, but keep an eye on them. Hopefully, their process will be proven commercially viable.
It’s been speculated that stones in many ancient megaliths are the result of a softening agent, pouring the slurry into a form, then adding a hardener back into the slurry. All of this done through chemical processes with no heat involved. If we can reproduce this, or invent a process that does this, we could have roads and buildings built of some of the hardest stones out there, far better than cement. Afterall, you can’t tell me that ancient peoples, with no power tools, cut and moved up to 100-ton stones from quarries miles away. We’re missing something.  
There isn’t a more blatant example of how shortsighted our clean energy strategy is than this one. How could any state consider shutting down a power source that still provides almost 9% of its electricity without a solid plan to replace it?
Small drones are everywhere. At times I think they blot out the sun. And they are very inexpensive — The highly rated Black Falcon 4K camera drone only costs $99 to $199.
CO2 | Shipping
COP could be an essential component to addressing climate change. However, as currently constructed, it’s mostly a waste of time. Here are my final recommendations on how to fix it.
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