Matevž Lenarčič, a Slovenian aviator and environmental researcher, has flown around the world several times with ultralight aircraft to investigate black carbon concentrations that negatively affect the climate as they warm the atmosphere.
During his flights, he obtained outstanding data for scientific research on environmental change. He first set off on a 39,700-kilometer trip around the world on Pipistrel's ultralight Sinus aircraft in 2004, when he also entered the flight in the Guinness Book of Records. He then flew around the world in 2012 with the ultralight aircraft Pipistrel Virus SW. He also flew over Mt. Everest on this route as part of the GreenLight WorldFlight project. Finally, on March 25, 2016, as part of the GreenLight WorldFlight project, Aerospool's Dynamic ultralight aircraft flew around the world with a special mission, measuring the concentration of black carbon in the air on its 42,000-km route. The results of the measurements were collected for a scientific research study of the role of black carbon in global pollution causing climate change.