![Swiss farmer and charcoal maker Markus Wicki arranges a pile of tree trunks which will be used to make charcoal, near the remote village of Romoos, central Switzerland in this June 12, Swiss farmer and charcoal maker Markus Wicki arranges a pile of tree trunks which will be used to make charcoal, near the remote village of Romoos, central Switzerland in this June 12,](https://c8.alamy.com/compfr/2e6rc40/swiss-farmer-and-charcoal-maker-markus-wicki-arranges-a-pile-of-tree-trunks-which-will-be-used-to-make-charcoal-near-the-remote-village-of-romoos-central-switzerland-in-this-june-12-2008-file-photo-the-wickis-are-one-of-few-mountain-farming-families-in-the-region-of-the-napf-mountains-who-have-carried-on-the-generations-old-tradition-of-natural-charcoal-making-using-a-slow-burning-pile-procedure-the-pile-once-it-is-lit-needs-to-be-constantly-checked-every-three-hours-during-the-process-which-takes-up-to-three-weeks-the-charcoal-is-only-produced-from-spring-to-autumn-and-can-fetch-up-t-2e6rc40.jpg)
Swiss farmer and charcoal maker Markus Wicki arranges a pile of tree trunks which will be used to make charcoal, near the remote village of Romoos, central Switzerland in this June 12,
![White-backed Woodpecker Male On Tree Trunk, Finland Photograph by Markus Varesvuo / Naturepl.com - Fine Art America White-backed Woodpecker Male On Tree Trunk, Finland Photograph by Markus Varesvuo / Naturepl.com - Fine Art America](https://images.fineartamerica.com/images/artworkimages/mediumlarge/2/white-backed-woodpecker-male-on-tree-trunk-finland-markus-varesvuo--natureplcom.jpg)
White-backed Woodpecker Male On Tree Trunk, Finland Photograph by Markus Varesvuo / Naturepl.com - Fine Art America
![Sections of the trunk of an oak tree hollowed due to the brittle cinder are stacked on an avenue near Bad Segeberg, Germany, 25 May 2013. Photo: Markus Scholz Stock Photo - Alamy Sections of the trunk of an oak tree hollowed due to the brittle cinder are stacked on an avenue near Bad Segeberg, Germany, 25 May 2013. Photo: Markus Scholz Stock Photo - Alamy](https://c8.alamy.com/comp/D8DT66/sections-of-the-trunk-of-an-oak-tree-hollowed-due-to-the-brittle-cinder-D8DT66.jpg)
Sections of the trunk of an oak tree hollowed due to the brittle cinder are stacked on an avenue near Bad Segeberg, Germany, 25 May 2013. Photo: Markus Scholz Stock Photo - Alamy
![Markus TRUNK | Research Assistant | Technische Universität München, München | TUM | Faculty of Physics | Research profile Markus TRUNK | Research Assistant | Technische Universität München, München | TUM | Faculty of Physics | Research profile](https://c5.rgstatic.net/m/437738464651637/images/template/default/profile/profile_default_l.jpg)