20 years ago, the ecological crisis was already quite evident. Enough for world leaders to worry about it, and to call for a global “Earth Summit”.

At the time, humanity yearly consumed resources and caused pollution at a rate that Nature could regenerate in approximately one year time. But it was clear that this rate was growing. The environmental crisis was growing and the unsustainability of the (even then) current way of life was obvious.

The response of the Earth Summit in Rio (1992), was the launching of the concept of “sustainable development”. The concept was based on three “interdependent and mutually reinforcing pillars”: economic development, social development, and environmental protection. The basic idea was that the three are compatible, and that there does not need to be a contradiction between economic development and protection of the environment.

Evaluating the “pilars”

20 years is quite some time to see if a proposed scheme works, so, time for an evaluation of the evolution of the three interdependent pillars:

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