To figure out the annual date, the group analyzes United Nations statistics on thousands of economic areas like fisheries, forests, and energy production, among others. The group’s co-founder Mathis Wackernagel told Deutsche Welle on Monday that there is a clear climate villain in the midst—fossil fuels.

“Currently the carbon footprint makes up more than 60 percent of humanity’s ecological footprint. Our economy is built very heavily on fossil fuels, and that’s the challenge we face. We have agreed that moving over 2 degrees Celsius is an unacceptable target for humanity. That translates into very clear physical constraints,” he said.

“That means we cannot have more than 20 years at current emissions levels. That means, in a very short time frame, we will have to move out of fossil fuel use,” he explained.

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