Footprint measurements Ecological footprint

ecological footprint different nations compared human development index.

ecological footprints can calculated @ scale: activity, person, community, city, region, nation or humanity whole. cities, due population concentration, have large ecological footprints , have become ground 0 footprint reduction.

global footprints: there no fixed way measure global footprints, , attempts describe capacity of ecosystem in single number massive simplification of thousands of key renewable resources, not used or replenished @ same rate. however, there has been convergence of metrics , standards since 2006.

city ecological footprints: being measured. there 2 types of measurements in use. first measures ecosystem displacement defined city area minus remaining green spaces. area measurement not include human or other biological activity. second attempts quantify surviving ecosystem health. specifically, attempts quantify both area , biological health of ecosystems surviving inside city areas such nature reserves, parks, other green spaces. city footprints being calculated , ranked city ecological indexes.