Data availability
The greenhouse gas data, satellite data, instructions and manuals for the citizens, and all in-situ derived temperature and pH data can be accessed at the supplementary material. All sequenced amplicon data for this study and their raw reads are available from European Nucleotide Archive (ENA, https://www.ebi.ac.uk/ena/browser/home, PRJEB53570). All data that support the findings of this study are available from the corresponding author on request as well. Code and R scripts used to analyse the data are available on Github except for analyses where all settings are fully reported in the Methods.