ARTICLE AD BOX
Vitor Martinez, a 25-year-old musician and community organizer, lives in Porto Alegre, the capital of Rio Grande do Sul — the southernmost state in Brazil. Martinez’s neighborhood borders Guaíba Lake, around which Porto Alegre’s main attractions are clustered. On a sunny, 80-degree Fahrenheit day in late March, people biked, ran, and strolled along the promenade that surrounds the lake.