Earth Overshoot Day
Earth Overshoot Day is the calculated calendar date on which humanity's resource consumption for the year exceeds Earth's capacity to regenerate those resources that year. In 2025, it fell on 24 July. The term "overshoot" represents the level by which human population's demand overshoots the sustainable amount of biological resources regenerated on Earth. When viewed through an economic perspective, the annual Earth Overshoot Day represents the day by which the planet's annual regenerative budget is spent, and humanity enters environmental deficit spending. Earth Overshoot Day is calculated by dividing the world biocapacity, by the world ecological footprint, and multiplying by 365, the number of days in a year:
Earth Overshoot Day is calculated by Global Footprint Network and is a campaign supported by dozens of other nonprofit organizations. Information about Global Footprint Network's calculations and national Ecological Footprints are available online.
Background
of UK think tank New Economics Foundation originally developed the concept of Earth Overshoot Day. Global Footprint Network, a partner organization of New Economics Foundation, launches a campaign every year for EOD to raise awareness of Earth's limited resources. Global Footprint Network measures humanity's demand for and supply of natural resources and ecological services. Global Footprint Network estimates for 2024 that in just about seven months, humanity demanded more from nature than the planet's ecosystems can regenerate in the entire year. Human demand includes all demands that compete for the regenerative capacity of the planet's surface, such as renewable resources, CO2 sequestration, and urban space.According to Global Footprint Network, throughout most of history, humanity has used nature's resources to build cities and roads, to provide food and create products, and to release carbon dioxide at a rate that was well within Earth's budget. But by the early 1970s, that critical threshold had been crossed: Human consumption began outstripping what the planet could reproduce. According to their accounts, humanity's demand for resources is now equivalent to that of more than 1.7 Earths. The data shows us on track to require the resources of two planets well before mid-21st century. They state that the costs of resource depletion are becoming more evident. Climate change — a result of greenhouse gases being emitted — is the most obvious result and widespread effects. Other biophysical effects include: deforestation, species loss, soil erosion, or fisheries collapse. Such resource insecurity can lead to economic stress and conflict.
Global Footprint Network maintains that ecological footprint accounts document the gap between human demand and regeneration. According to them, demand is now exceeding what the planet renews. They recognize that the accounting can be improved, and more details added, believing that in its current applications to countries the accounts typically underestimate human demand as not all aspects are measured. They also claim to overestimate biocapacity because it is ambiguous to determine how much of current yields are enabled by reduced future yield. Mathis Wackernagel, founder and president of the Global Footprint Network, states that soil depletion on crop land could be included in the Ecological Footprint accounts informing EOD, but that would "require data sets that do not exist within the UN data set". Thus, they claim ecological footprint accounts are metrics that merely define minimal conditions for sustainability, and that human impact on the planet is likely higher than the results that their accounts reveal.