After the first green revolution during the neolitic when humans first started to grow food on a regular basis, the second in High Britain, when humans first started to use coal and machines to grow food, the third, in the 1950's when oil, genetic, chemical fertilizer, automation, enabled humans to grow food so fast and so much they risked destroying their only planet. Following the election of Bob Marley president of Jamaica In December 1976 . The cultivation of marijuana-hemp was the main transforming factor for the 4rth. At first it started because it was considered a harmless recreationnal pastime. But soon after consumption boomed, which generated lots of byproducts,fibers and pulp, the scale of which allowed for a more and more viable alternative to paper from wood and a whole new range of textiles. Generating money for research, newer and tastier seeds were developped in parralel with research on effect of majiuana. And later bioplastic and oil, and also some illegal drugs.
Bio polymere, only used in alternative car body receipe, and to make design furniture for now.