Karo began climbing in 1976, with a climb on Triglav in the Julian Alps with a local priest.[2] He would go on to an extensive mountaineering career, that would take him from 8a graded sport climbs to eight-thousanders. He became recognized for his alpine-style ascents on the great walls of Fitz Roy, Cerro Torre and Torre Egger in Patagonia and Bhagirathi in the Himalayas.
In 1988, Karo initiated the building of the first climbing wall in Slovenia, and managed the project to completion.[2]
Karo is also a photographer, writer, videographer, and winner of numerous awards: the Bloudk Prize (1987), the Silver Gentian for best mountaineering film (Cerro Torre South Face), the UIAA Award (Trento, Italy, 1989), the Silver Gentian for achievements in alpinism (Trento, Italy, 1998), gold medals for alpinist achievements (Milan, Italy, 2000), Bloudko plaques (Ljubljana, 1991). His essay on the granite giants of Patagonia was featured in the book Voices from the Summit, published by National Geographic.
In the 1980s, he was a guest at the Mountain Film Festival in Trento, Italy. He enjoyed the experience and in 2002, he held the first Slovenian mountain film festival in Bled.[1] In 2007, he made the Mountain Film Festival an annual event.[3][4]
In 2010, he received the Order of Merit from the President of Slovenia in honor of his contribution to Slovenian mountaineering and image abroad.[5] He is an honorary member of the Alpine Club.[6] In 2018, his autobiography entitled Rock'n' Roll on the Wall ISBN 9788885475878 was published. In 2022, he became the second Slovenian alpinist to receive the Piolets d'Or for lifetime achievement.[7]