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P M

@GrowinFlorida, what bothers me about the current concrete trend is that cement (concrete is cement mixed with sand or aggregate) is possibly the least “green” building material there is. Yet people constantly claim it’s eco-kosher. Cement plants are the biggest producers of carbon dioxide — pumping tons of it into the atmosphere — and are among the highest users of electricity (which is even more carbon dioxide, if that comes from burning coal or oil). Limestone for making cement comes from open-pit mining, leaving the earth permanently scarred. Limestone kilns at cement plants often burn toxic watste from steel manufacturing (slag) — which creates carcinogenic compounds (hexavalent chromium) — or even (filthy, polluting) old tires. And on and on. Add to that the fact that concrete with embedded rebar degrades over time, falling apart from the inside out.

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GrowInFlorida

@pfmaher something to think about... what's the material that is as cheap, sleek-looking, long-lasting but ecological at the same time? Seems like incompatible characteristics if you remove concrete from existence. I wish it were greener but what are the alternatives? I tried for months to find concrete-looking materials that wouldn't require weird super-expensive shipments from abroad, and failed. What about you? not being sarcastic, I'm truly interested to find that material(s) for my future projects without burdening our already-burdened ecology...

   
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P M

GrowinForida: wood (trees grow a lot faster than the hundreds of thousands to millions of years it takes for limestone to form), brick (made from raw, young earth scraped from the surface, so no blast mining, although transportation can be high carbon footprint), rammed earth and cob building methods, recycled anything. Concrete recycling is still early days, but those products will, I think, soon be a real option for home builders. I have read about various greener, currently available alternatives to the conventionally manufactured cement block, too (Watershed is one such manufacturer).

It’s not that I think concrete should disappear, but object to the way it is so often greenwashed in design logs and mags.

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