Extinction Rebellion Brecon present two talks, each of which is the same, by Dr Aaron Thierry, a climate scientist based in Cardiff, who received his PhD in Ecology from the University of Sheffield. He subsequently researched the impacts of global warming on the carbon cycle in Arctic ecosystems. His studies have led him to be very concerned about the potential impacts of disruptions to our climate. A passionate advocate for environmental and social justice Aaron was one of the thousands who took part in Extinction Rebellion’s national days of action in London last November. More stories