This undated document from Imperial Oil Ltd, the Canadian subsidiary of Exxon, is a “Glossary of some environmental and related terms.” This document is part of the ClimateFiles Imperial Oil document set, gleaned by DeSmog researchers from the Glenbow Imperial Oil Archive Collection.

The glossary includes definitions for “environment” and “pollution,” and also quantifies the difference between “spill, minor oil,” “spill, moderate oil,” and “spill, major oil”.