Humanity has already used up Earth's natural resources budget for the year

Global warming in California
(Image credit: David McNew/Getty Images)

August 13 is 2015's Earth Overshoot Day, marking the point "when humanity's annual demand on nature exceeds what Earth can regenerate in that year," think tank Global Footprint Network says. Beginning Friday, humanity will already be in debt for 2015.

Ecological Debt Day, as Earth Overshoot Day is also called, is calculated by dividing the amount of natural resources generated by Earth in a year by how much humanity consumes. That number is then multiplied by 365. In 1987, the overshoot date was December 19; in 2014, it was a week later than this year, landing on August 19. Not altering a course in sustainable spending would mean "using the resources equivalent to two planets by 2030, with Earth Overshoot Day moving up on the calendar to the end of June," the Global Footprint Network reports.

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Jeva Lange

Jeva Lange was the executive editor at TheWeek.com. She formerly served as The Week's deputy editor and culture critic. She is also a contributor to Screen Slate, and her writing has appeared in The New York Daily News, The Awl, Vice, and Gothamist, among other publications. Jeva lives in New York City. Follow her on Twitter.