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(AB) Understanding the determinants of resource inequality has become a mega challenge for many economic models that also serve as predictors of future ecological and economic scenario.
(AC) The residents of cities, which house a growing part of humanity, feel that an environment that had been mainly vegetable is now being mineralized.
(AD) The world of the infinitely small is increasingly open to our manipulation, while the whole earth has recently become fair game for use on a massive scale by the human species. ------------------------------------------------------------------------------