The paper discusses the concept of ecological footprint, a resource accounting tool that can track the amount of resources we have, how much of it we us,e and how much of what we consume can be generated naturally. It measures the productive land and sea area (known as bio-capacity) we need for local consumption and export, as well as to absorb wastes we generate, such as carbon emissions. The author emphasized that the computation for ecological footprint is not just based on individual habits but also on the kind of built environment (i.e., buildings, highways/bridges, power stations) of our communities).