Mont Blanc massif led to calls to limit access to the most popular summits and for the mountains to be treated with greater respect. The Mont Blanc massif has provided numerous opportunities for academic research, dating back to the very first ascent of Mont Blanc in 1786 during which Michel Paccard carried scientific equipment to confirm it as the highest summit. In 1820, an ill-fated expedition led by Dr Hamel included pigeons intended for release at varying altitudes to measure the impact of reduced air density on their ability to fly. In 1890, Joseph Vallot built a small meteorological observatory at approximately between
Cotopaxi F. Ribas Refuge. This stone mountain hut — owned and operated by Grupo Ascensionismo del Colegio San Gabriel — is situated 200 m higher at 4800 m (a 40-80 minute uphill hike). Here climbers can spend the night and begin their summit bid in the early morning without any intermediate camps. (Typically no more than about half of those attempting to summit Cotopaxi make it to the top after a daunting — though non-technical — six-hour scramble.) Summiting normally starts around 12:30 am to reach the summit at latest 7:30 am and then return to the hut before the snow