By the 2nd of August this year, humanity had already used up all the resources earth can replenish within one year. It's called 'World Overshoot Day'. The date has been moving forward every year in the past decades. The calculation is an initiative by the Global Footprint network. Its founder, Mathis Wackernagel, explains why we have to change our consumption patterns.
(Interview: Anke Rasper)