Ecological processes are crucial for maintaining biodiversity, which in turn supports both human health and the economy. In Finland, we have a unique knowledge reserve composed of long-term series of nature observations. By fully utilising this reserve, we can understand environmental change and their impacts on communities of organisms and the ecosystem services they provide. In REC, we bring together the leading experts in the field, along with the data creators, to tap into this reserve, to develop new methods, and to disseminate the results to relevant stakeholders.