Hempcrete?
The hempcrete blocks make me think a whole lot of straw bricks, a pretty old composite technology - which falls into my frequently-reinforced observation that the more environmentally friendly a technology is, the more likely it is to be an updated version of technology that humans were using a thousand or more years ago.
Here the 'hempcrete' is really hemp hurd mixed with lime. The lime then absorbs carbon dioxide from the atmosphere as the hempcrete sets.
Hemp has long been put forth as a renewable resource with fibers that can be useful in lots of ways.
If you're interested in learning more about hempcrete...
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