The GEO Symposium and Open Data and Open Knowledge Workshop is being held in eastern China's Hangzhou City. The Group on Earth Observations – or GEO – is the world's largest intergovernmental body dedicated to studying the Earth. The opening ceremony of the event was held on Monday. Under the theme 'From Vision to Action', the event focuses on translating the GEO Post-2025 Strategy into a detailed implementation plan, and aims to advance collaborations on pressing issues related to Earth observation data, knowledge and infrastructure. More than 400 representatives from China, the United States, the European Commission, South Africa, and other countries and international organizations are attending. They will discuss topics such as ecosystems, climate change, and urbanization. This is the first GEO international conference held in China in 14 years, after the 2010 GEO Ministerial Summit.