According to Wikipedia: Ecological footprint analysis approximates the amount of arable and agriculturally or ecologically productive land area it takes to sustain one human or group of humans, say in a family or city, based on their use of energy, … Continue reading →

Wikipedia is a continuously and collaboratively updated encyclopedia. Its description of sustainability (and many other topics) is worth the detour.weblink: Wikipedia Sustainability • from: Wikipedia • in detail XlnkS6D5 XlnkC193A