In 2016, Jarvis and colleague Royal Marines Sergeant Major Barry Gray went on an information-gathering and mountain-climbing expedition to Ecuador for the 25zero project. They successfully summited three glaciated mountains in Ecuador: Illiniza Sur (5,248 m), Antisana (5,704 m) and Chimborazo (6,310 m). The trip coincided with the ongoing UN climate change talks in Marrakech (COP22).