The LexiCon Research Group at the University of Granada developed and provided their highly specialised English EcoLexicon corpus built up of environmental texts. The corpus is hosted as an open corpus and is freely accessible even without a Sketch Engine account.
The corpus is a great source for searching keywords and terms from the field of environment. The EcoLexicon enables the user to search in a specific language variant (British, American, etc.), sort results by a country or year of publication, even specify a domain or genre.