The Copernicus Climate Change Service (C3S) provides tangible and authoritative information on past, present and future climate in Europe and the rest of the World. The C3S mission is to support climate adaptation and mitigation policies regarding the impact of climate change by offering free and open access to climate data and tools. C3S is implemented by the European Centre for Medium-Range Weather Forecasts (ECMWF) on behalf of the European Commission.