While waiting inside a gate at London’s Heathrow Airport on her way back to Israel, Eliza Mayo mulled over her experience at COP26 and how the global climate change conference could benefit her work at home. Mayo, a former Squirrel Hill resident, is deputy director at the Arava Institute for Environmental Studies, a nongovernmental organization located in southern Israel. Along with her colleague, Tareq Abu Hamed — the institute’s executive director — Mayo spent three days networking, listening and learning along with fellow climate activists, change agents and politicians. Global leaders, including President Joe Biden, Israeli Prime Minister Naftali Bennett,...