Fotografie požadující uvedení zdroje:

eco-friendly: [fotka upravena] Photo by Merrill Smith. – U.S. Department of Energy from United States, Public domain, via Wikimedia Commons

houbová-farma: [fotka upravena] Arne Müseler / www.arne-mueseler.com, CC BY-SA 3.0 DE <https://creativecommons.org/licenses/by-sa/3.0/de/deed.en>, via Wikimedia Commons

schema-hydroponie: Dhgisme, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons

fotobioreaktor: IGV Biotech, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons
fotobioreaktor-2: AlgaEnergy, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons

odpad-z-bioplynek: Photo by Jakub Minka for ZNZ Pelhřimov s.r.o. <http://znzpelhrimov.cz/wp-content/uploads/2020/05/DJI_0252-em.jpg>