Sections Science & Environment Environment Partager Beat Oertli, a pond specialist Émission CQFD 24 November 2017 Beat Oertli Haute école du paysage, d’ingénierie et d’architecture de Genève - HEPIA, HES-SO Légende One hour to get to know this tireless defender of ponds and other small gouilles. #ENVIRONMENT 1188 Interventions #ECOLOGY 354 Interventions #EARTH 490 Interventions