I recently participated in the great Legal Histories of Empire conference that met in Maynooth, Ireland. There were a number of papers on environment-related topics (especially about the oceans), but one that really stood out for me was that of Erin Braatz on nuisance law in colonial Gold Coast (Ghana).
Braatz showed that the largest category of criminal prosecutions in the Gold Coast was for nuisance, and especially sanitary offenses, and suggested a surprising (for me, at least) explanation: the colonial government's desire for forced labor. After the abolition of slavery, colonial rulers and settlers cried out for (cheap) working hands, and sentencing locals to terms of labor for nuisance violations was one way of providing them.
I've often noted before connections labor issues and environmental regulation, but Braatz's research suggests a new (and unsettling) angle.