This index is an ongoing study, updated and refined quarterly. Many of the cities studied are now approaching their data collection limits, which brings us to the next phase of development: identifying and collecting data that measures bio-capacity and human anthropogenic footprints in greater depth. This is an iterative process that requires collaboration with all levels of government, academia and industry. The goal is to create tools that give people greater visibility into human impact on the biosphere and identify areas where solutions can have substantial impacts.
All formulas and equations used are published at the bottom of this article and they are further described in detail spreadsheets for each city.
One indicator was removed.
- Economic Activity was removed due to insufficient data relevance