Dataset associated with the publication "Planetary Boundaries Assessment of Flue Gas Valorization into Ammonia and Methane" by Sebastiano C. D'Angelo, Julian Mache, and Gonzalo Guillén-Gosálbez, available at https://doi.org/10.1016/B978-0-323-95879-0.50134-X. The dataset includes the numeric data associated with Table 1 and Figure 2, converted into a machine-readable format. The structure of the dataset is here elucidated sheet by sheet: StreamTable: numerical values associated with full set of streams depicted in Figure 1, among which a selection is reported in Table 1. LCA-Results: numerical values associated with the breakdown of the environmental impacts for the selection of scenarios reported in Figure 2, for all the assessed control variables.