Per capita ecological footprint (EF), or ecological footprint analysis (EFA), is a means of comparing consumption and lifestyles, and checking this against nature's ability to provide for this consumption.
This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. (April 2016) (Learn how and when to remove this template message) A Product Requirements Document (PRD) is a document containing all the requirements to a certain product. It is written to allow people to understand what a product should do.
document. 1  to provide with a document or documents. 2  to provide (a book, pamphlet, etc.) with documents or supporting references. 3  to prove, as by reference to documents. 4  to gather and report the details of; cover or chronicle.