Bento Rodrigues, Brazil – Bricklayer Wallison Henrique de Souza, 28, always dreamed of owning his own home. In three years, he spent about $10,000 to build a small one-storey house next to his mother in Bento Rodrigues, a village in the Mariana district of Brazil’s mineral-rich state Minas Gerais. Mariana’s economy is based on mining. Samarco…