Earth Overshoot Day Guess-the-Date Contest

Earth Overshoot Day is the date when we have used more from nature than the planet can replenish this year. Can you guess the date for 2019?

The country Footprint data currently available on Global Footprint Network’s open data platform are from the National Footprint Accounts 2018 edition (calculated from 2014 UN-vetted data, then the latest data available.) This is the data that led to the calculation of August 1st as Earth Overshoot Day 2018 by our team of researchers.

Explore the data platform and use other information available on this website (hints here and there) to come up with the method that gives you the correct result for Earth Overshoot Day 2018. When the National Footprint Accounts 2019 edition is released in April, it should be fairly straightforward to plug in the new data to calculate your best estimate for Earth Overshoot Day 2019.

Our hope is that participants gain a better understanding of what Earth Overshoot Day is all about. And we want them to learn why solutions to #MoveTheDate are crucial to achieving sustainability, as defined by humanity’s ability to live within the means of our one planet. To help you with this activity, we have created a Lesson Plan, ideal for grades 6-8, but adaptable for other grade levels.

May 22, 2019 (International Day for Biological Diversity) is the deadline to submit your calculation methodology and result below.

The winner, as well as the date of Earth Overshoot Day 2019, will be announced on June 5.

  • Accepted file types: xls, xlsx, doc, docx, pdf.

“Earth Overshoot Day is a great opportunity to run some algebra and learn about what that hard-stop date means.”

Everybody knows that taking anything faster than it is being put back doesn’t work, argues Jaimie Cloud, the founder and president of the Cloud Institute for Sustainability Education in New York City. Although obvious with regard to personal finances, this equation is not on most people’s minds when it comes to managing our natural capital. So everyone needs to learn how to do the math, she adds. Watch her full interview with Laurel Hanscom, Global Footprint Network CEO, recorded on the eve of Earth Overshoot Day 2018.