In a recent book about natural building materials, the firm LTL Architects discussed the growing problem of fossil-fuel-derived products in residential construction… from vinyl floors and siding to plastic lumber. …For a small but growing community of building professionals, part of the solution lies in an unlikely source: hemp. Ryan Doherty, of the U.S. Hemp Building Association, said hemp can be used in a wide variety of building products, from outdoor cladding to acoustic panels. …In the US, the field has been stunted by the long prohibition on growing hemp stemming from the Marihuana Tax Act of 1937. This ban was reversed in the 2018 Farm Bill… but confusion around the relationship between marijuana and hempcrete still affects the industry. Although hemp building materials have no psychoactive properties, “everyone thinks that we can smoke the house,” he said. Fewer than 100 hemp homes have been built in the US.