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Growing potatoes on Mars: Ecological footprint

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There only 4 root causes of unsustainability. We need to stop doing those 4 things to become sustainable:

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Definition of sustainability base on science: easy to understand with drawings

Ecological footprint: do we fit on our planet? Watch

Earth Overshoot Day

Earth Overshoot Day / How many China's does it take to support China

How many earths do 2014 FIFA World Cup countries need to meet their demand on nature?

Do nations with big ecological footprint score more goals?