by Rosa SULLEIRO SAO PAOLO, Brazil (AFP) — Even under three blankets, Marcio Carvalho can’t stop shaking as he seeks shelter on the streets of Brazil’s biggest and richest city, Sao Paulo. The teeming central streets of a city that is home to 20 million people are deserted at night except for members of the estimated 16,000 homeless population. And while much of Brazil basks in tropical conditions, a chilly wave in the first days […]