While various dedicated sensors for a broad range of environmental parameters exist, usually together with specialized applications for automated data analysis, there are still many environmental phenomena that cannot be easily captured. An example is soil degradation and erosion. In other cases, even though sophisticated sensors exist, the sensor information can hardly be processed automatically, especially when is consists of or includes images, 3D models, etc. Examples are invasive alien species which can only be identified with the help of professional or lay taxonomists. In our work, we have devised a smartphone app (COSA) in collaboration with experts from the environmental sciences that supports the crowdsourcing of data capturing and/or data analysis in the environmental sciences.