Earth Overshoot Day

Overshoot Day is the day that marks the exhaustion of the renewable resources that the Earth is able to regenerate within a calendar year. Every year the Global Footprint Network, an international non-profit organization that studies the ecological footprint of all countries, estimates the date based on the speed with which resources are exploited.

According to this calculation, if only rich and industrialized countries existed in the world, 

we would need five planets to support our daily consumption.

First, the global terrestrial biocapacity is calculated, i.e. the "biological reserve" that allows the ecosystem to regenerate resources and absorb the carbon emitted. Humanity's needs are then estimated in terms of carbon emissions, cultivated land, exploitation of fish stocks and use of forests. Finally, the number of days in which the two data compensate each other is calculated: the days in which consumption exceeds the "reserve" are called overshoot, as they exceed the available resources.