According to Earth Overshoot Day:
Earth Overshoot Day marks the date when humanity’s demand for ecological resources and services in a given year exceeds what Earth can regenerate in that year. We maintain this deficit by liquidating stocks of ecological resources and accumulating waste, primarily carbon dioxide in the atmosphere.
The graph here is from statista and is from data posted by Earth Overshoot Day. The Earth Overshoot website has useful materials for teachers.