Vicens, J. Bueno-Guerra, N. Gutierrez-Roig, M. Gracia-Lazaro, C. Gomez-Gardeñes, J. Perello, J. Sanchez, A. Moreno, Y. Duch, J. Resource heterogeneity leads to unjust effort distribution in climate change mitigation PLoS One 10.1371/journal.pone.0204369 2018 2018