["Journal of Law and Society, Volume 48, Issue 2, Page 202-225, June 2021. ", "\nAbstract\nScholars often assume that social movements and civil society organizations can draw on deep wells of traditional resources, such as money and lawyers, to finance legal mobilization. However, resource mobilization is rarely so straightforward in developing countries such as Mexico. I show how under‐resourced civil society organizations create and mobilize alternative resources which they share with marginalized communities, increasing those communities’ access to environmental justice. This occurs in developed countries too, but where money is scarcer, alternative non‐material resources are more important. The findings contribute to debates on social movement resource mobilization and on legal mobilization in defence of vulnerable communities facing development pressures from extractive and other industries. The article also provides a fine‐grained analysis of how environmental movements act on the ground, focusing on Mexico as an important case of environmental mobilization in a context of poorly resourced and vulnerable communities.\n"]