A mega-mural inaugurated in Sao Paulo serves as a remnant of the deadly environmental disasters that have devastated Brazil this year, painted with ash from the country's wildfires, one of the worst forest fire seasons on record, and mud from the historic floods in Rio Grande do Sul in May. "Art has the power to touch people and create a much stronger change," says the author, Brazilian street artist and activist Mundano, whose work denounces deforestation and environmental degradation. IMAGES AND SOUNDBITES