At the foot of the Andes, a Canadian firm has plans for one of the country’s biggest copper mines, but many say the carbon-rich forests and clean rivers are too high a price to pay At the foot of the Andes, a Canadian firm has plans for one of the country’s biggest copper mines, but many say the carbon-rich forests and clean rivers are too high a price to pay A s the sun sets over the Colombian Amazon, construction worker Pablo Portillo observes the canopy. Titi monkeys swing in the treetops as