The golden state legalised marijuana production in 2016, but strict curbs have led to a thriving black market. Its hub is in Siskiyou county, where the environmental damage is clear to see
In the shadow of Mount Shasta in northern California, a sea of makeshift greenhouses and plywood huts sprawls between the conifer trees of the high desert. From the air, many of the polytunnels look in bad shape, their plastic covers torn by the wind to reveal what’s inside: hundreds of cannabis plants packet tightly together, their distinctive green leaves easily identifiable against the volcanic soil.