The free downloads associated with the links to my recently published articles in Astrobiology and Earth and Planetary Science Letters have expired. I have replaced those links to those of the articles. The links to those articles can also be found here.
Webster KD, Drobniak A, Etiope G, Mastalerz M, Sauer PE, Schimmelmann A (2017). Subterranean karst environments as a global sink for atmospheric methane. Earth and Planetary Science Letters, 485, 9-18. https://doi.org/10.1016/j.epsl.2017.12.025
Stelmach KB, Neveu M, Vick-Majors T, Mickol R, Chou L, Webster KD, Tilley M, Zacchei F, Escudero C, Flores Martinez C, Labrado A, Fernández E (2018). Secondary electrons as an energy source for life. Astrobiology, 18(1), 1-13. http://doi.org/10.1089/ast.2016.1510