Today, August 22nd, is Earth Overshoot Day. Over the last 8 months, there has been more demand on renewable resources and CO2 sequestration than the planet is able to provide over the coarse of a year.
In 1992 it occurred on October 21st.
In 2002 it occurred on October 3rd.
Over the last 20 years, Earth Overshoot Day has continued to arrive a few days earlier each year. With its arrival in August, and 4 months left in 2012, it is clear our demand and consumption of natural resources needs to change.