On 30 July this year, the world is observing Earth Overshoot Day, the date when humanity is expected to have consumed all the biological resources that the Earth can regenerate during the entire year. Earth Overshoot Day is therefore much more than another environmental observance. Urgency of engagement of UNSome may ask why Earth Overshoot Day has never become an official United Nations observance. Unlike World Environment Day, Earth Overshoot Day did not emerge through diplomatic negotiations. Earth Overshoot Day has already given humanity an annual ecological mirror.