3. Ecological Debt Day
Perhaps the most guilt-inducing holiday, Ecological Debt Day, AKA Earth Overshoot Day, takes place on the day in which we have used up our resources for the year. Meaning, humanity has used more than the earth can regenerate for the year. It started in 1987, though humanity first went into overshoot the year before. In 1987, we acknowledged the extent of our resource gluttony on December 19. Last year, the holiday took place on August 22. The New Economics Foundation calculates the calendar day of Ecological Debt Day by using the following formula: (world biocapacity/world ecological footprint) x 365.