Concret, ideea constă în regândirea tuturor orașelor lumii astfel încât utilizarea mașinilor personale să devină inutilă. Ideea a fost prezentată de fostul vicepreședinte american Al Gore, de fostul președinte mexican Felipe Calderon și de colegii lor din cadrul Comisiei Globale privind Economia și Clima, și este inclusă într-un raport mai amplu care vizează lupta împotriva încălzirii globale.
Mijloacele principale prin care s-ar ajunge la un astfel de deziderat sunt o dezvoltare urbană compactă, de exemplu, prin construirea unor cartiere mixte din punct de vedere social și funcțional, îmbunătățirea domeniului transportului public, cu ajutorul tehnologiei, punându-se accent pe sisteme de transport inteligente, dar și o guvernare coordonată, realizată de instituții eficiente și responsabile. În cazul în care acest megaproiect s-ar pune în aplicare, costurile s-ar ridica la aproximativ 90 de mii de miliarde de dolari, sumă ce se refera, de fapt, la investițiile totale în infrastructura urbană în următorii 15 ani.
Cheia reușitei proiectului va consta în convingerea tuturor primarilor de pe pamant de foloasele sale, în termeni de eficiență și prosperitate pentru cetățenii lor.
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