Discover and read the best of Twitter Threads about #ecologicalfootprint
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Our world is not environmentally #sustainable: The #EcologicalFootprint, which equals EF per person multiplied by #population, of the current (2016) world population of 7.5 billion uses the biological capacity of 1.7 Earths. 
The maximum #sustainable #population at our current EF per person is only 4.4 billion. The maximum that would give everyone the current #QualityOfLife in the US, as measured by the UN’s #HumanDevelopmentIndex, is only 2.6 billion.
Since the start of EF tracking (1961), 83% of our #growth in EF has been caused by #population growth and only 17% by growth in personal #consumption (EF per person).
The US is not environmentally #sustainable: The #EcologicalFootprint, which equals EF per person multiplied by #population, of the current (2016) US population of 323 million uses the biological capacity of 2.2 Americas.
The maximum #sustainable #population at our current EF per person is only 145 million. The maximum that would maintain our current #QualityOfLife, as measured by the UN’s #HumanDevelopmentIndex, is only 253 million.
Since the start of EF tracking (1961), our #growth in EF has been caused entirely by #population #growth, more than offsetting a small reduction in our personal #consumption.
