Mexico's Blueprint for Green Buildings

Until last year, Armando Suarez lived his entire life in Ecatepec, a chaotic jigsaw of poor hillside neighborhoods that makes up Greater Mexico City’s largest municipality. Stretching north from the city’s limits, Ecatepec is a warren of informal magenta and turquoise block homes, stacked like Lego pieces and perched precariously, one on top of the other, on steep, ragged hills.