This document has been created by the community of Citizen Observatories and Citizen Science practitioners, as well as key collaborators that attended the Citizen Science working session in the EuroGEO Workshop taking place on July 3-5th, 2019 at the Pavilhão do Conhecimento in Lisbon (Portugal). The event was co-organised by the Portuguese Foundation for Science and Technology (FCT) and the European Commission (EC). This document summarises the current status of Citizen Science in GEO/GEOSS, reflects the vision, and objectives; identifies issues that are blocking its progress and proposes a way forward shared by the Citizen Observatories and Citizen Science projects under the EuroGEO community. Then, it proposes a shared vision, a clear set of objectives and some actions that will pave the way to progress towards that shared vision, based on aggregating citizen science into a federation of data services supported by the Citizen Science community activity in the GEO work program that represents the citizen science community. Finally, it defines a list of recommendations to the European Commission to improve the integration of the European Citizen Science and Citizen Observatories into GEOSS. It thereby emphasises regional strength and competences without losing sight of global collaborations.