High up in the Andes, between Bolivia and Peru, the people of Lake Titicaca are fighting for their existence. The "Lake of the Andes" is shrinking - and with it, water, food and hope are dwindling.

Our winter welcome to Bolivia wasn’t exactly warm. For Americans, the visa requirements are extensive. In addition to paying $160 each in unblemished, unfolded US currency, we were required to provide ...