Alex Hyde / Hoverfly (Helophilus pendulus) feeding on Hemp agrimony (Eupatorium cannabinum) Strumpshaw Fen, Norfolk, UK, September.

David Pattyn / Verreaux's sifaka (Propithecus verreauxi) jumping across a sisal plantation, Berenty Private Reserve, southern Madagascar, August 2016.

David Pattyn / People who work and live on the sisal plantations at the edge of Berenty Private Reserve, southern Madagascar, August 2016.

David Pattyn / Workers returning from Sisal plantations in tractor and trailer along dirt track, Berenty Private Reserve, southern Madagascar, August 2016.

Paul Harcourt Davies / Branched broomrape (Orobanche ramosa) parasitic plant, Preci, Umbria, Italy. June.

Andy Sands / Red admiral butterfly (Vanessa atalanta) feeding on nectar from Hemp Agrimony, Oxfordshire, England, UK, September

Stephen Dalton / Hoverfly (Eristalis arbustorum) on Hemp Agrimony (Eupatorium cannabinum) Sussex, UK

Stephen Dalton / Hoverfly (Eristalis arbustorum) taking off from Hemp Agrimony (Eupatorium cannabinum) Sussex, UK

Mark MacEwen / Aerial view of Sisal (Agave sisalana) plantation alongside spiny forest containing Octopus trees (Didiera madagascariensis) Berenty, Madagascar, October 2015.

Jeff Rotman / Rolled marijuana / cannabis joints, in cannabis dispensary, Denver, Colorado, USA, June 2015. Marijuana has legalized in the state of Colorado, and this farm produces Marijuana for medical and retail...

Jeff Rotman / Rolled marijuana / cannabis joints, in cannabis dispensary, Denver, Colorado, USA, June 2015. Marijuana has legalized in the state of Colorado, and this farm produces Marijuana for medical and retail...

Jeff Rotman / Man and woman with Cannabis plant in organic Marijuana farm, Pueblo, Colorado, USA, June 2015. . Marijuana has legalized in the state of Colorado, and this farm produces Marijuana for medical and reta...