Book excerpt: This book highlights the concepts and assessment methods of Ecological Footprints. Ecological footprint is defined as, ”a measure of how much area of biologically productive land and water an individual, population or activity requires to produce all the resources it consumes and to absorb the waste it generates, using prevailing technology and resource management practices”. Developed in 1992 by William Rees, it was the first footprint developed followed by other footprints such as Carbon, Water and Energy. Assessment of Ecological footprints strive for comparing consumption footprint to biological capacity. This book presents five interesting chapters pertaining to the assessment of Ecological Footprints.