Mountain Worlds

S1, E1: Travel to the far northeast of Mexico to the Serranias del Burro, a vital outpost for Mexico's black bears, where there is little groundwater for bears to drink. The grandest mountain vistas are found in the northwest of the country, including the Copper Canyon which covers 25,000 square miles and is home to the Rarámuri, who have lived in these mountains for more than 2,000 years. Perhaps the most famous mountain product is tequila, made from the blue agave plant. We meet a 16 year-old agave farmer, a jimador, harvesting plants with his uncle.