As the hysteria over the belief that pot was a “gateway” drug finally began to abate, and states slowly moved to legalize its medical and recreational uses, discussions about the benefits of marijuana have tended to focus on CBD and similar semi-medicinal uses. But the real benefit of a more sane approach to the plant is in the rediscovery of the multiple uses of hemp.
As Wikipedia reports, industrial hemp– a botanical class of Cannabis sativa cultivars grown specifically for industrial and consumable use– can be used to make a wide range of products. Along with bamboo, hemp is among the fastest growing plants on Earth. It was also one of the first plants to be spun into usable fiber 50,000 years ago. It can be refined into a variety of commercial items, including paper, rope, textiles, clothing, biodegradable plastics, paint, insulation, biofuel, food, and animal feed.
Pretty impressive!
It always seemed insane to me that disapproval of the more “recreational” use of marijuana plants had effectively prohibited the growth of hemp for these multiple benign purposes. (As I understand it–and I probably don’t– plants grown for industrial purposes lack the “recreational” element, but because the varieties look so much alike in the field, neither could be grown in jurisdictions that outlawed pot. In other words, most jurisdictions.)
Now it appears that hemp is being used in yet another promising way: as a climate-friendly building material. As the Guardian reports,
Cannabis sativa, the plant of the thousand and one molecules, has a long and expansive reputation – as a folk medicine, a source of textile fibre for clothes, for making rope or plugging holes in ships.
But now cannabis – or specifically its non-psychoactive variant, hemp – is being touted for something greater still: building blocks for housing that may avoid some of the environmental, logistic and economic downsides of concrete.
The cement industry is responsible for about 8% of planet-warming carbon dioxide emissions, alongside problems created by unyielding surfaces and low insulation, or R-value, properties. The search for large-scale alternatives has so far yielded few results, but on a small scale there are intriguing possibilities, including the use of hemp mixed with lime to create low-carbon, more climate healthy building materials.
“There’s an enormous growth potential in the US for hemp fibre used for building and insulation,” said Kaja Kühl, an urban designer and the founder of youarethecity, a design and building practice based in Brooklyn, New York. “Hemp was only legalised in 2018, but now industrial hemp is following the first wave of CBD and cannabis.”
The Guardian reports that there is a “fledgling network of advocates, designers and fabricators” who are working to enlarge the use of bio-based building materials, which they see as a way to dramatically reduce the upfront carbon footprint of materials that can account for some 80% of a building’s carbon lifecycle.
But more recently its ability to capture more than twice its own weight in carbon – twice as fast as traditional forestry – has come into focus. By some estimates, hemp can capture up to 15 tonnes of CO2 per hectare, through photosynthesis. Hemp cultivation taking up only 25% of the world’s agricultural land used for dairy and livestock would close the UN emissions gap of 23 gigatons of CO2 annually.
“Choosing materials that sequester a lot of carbon before they become construction materials can be very beneficial in this quest to get to carbon-neutral by 2050,” Kühl said, pointing out that the hemp that is used is the hurd, from the inner stem, and not the bark that is used for paper or rope.
This is so cool!
It is so easy to become discouraged about the current state of the world we inhabit. Listening to the daily reports of idiocy emanating from our various legislative chambers, cringing from the reports of devastation in Ukraine and the Middle East, scanning the reports of all-too-frequent episodes of mass gun violence…The bad news tends to overwhelm and drown out the good.
We need to remember–as I report here too infrequently–there are a lot of good people in the world doing a lot of very good things. They are making cool discoveries, inventing marvelous things and figuring out new ways to help those who need that help.
Those of us who prefer helping the good guys to feeding the resentments and insecurities of those who are barriers to progress have a job that is both difficult and disarmingly simple: we need to elect lawmakers who want to make it easier–not harder– for the good guys to move humanity to a better place.
At the very least, we need to vote out the MAGAs who want to take us back to a past that never was.