Oscar Limachi, 48, a member of the local Qewaya community who works as a tour guide on the Lake Titicaca, searches for duck eggs on a natural totora floating island in Qewaya village, Lake Titicaca, Bolivia, July 3, 2018. "Totora plants are diminishing, although they are not used much besides hand crafting, they signify much of the lake's ecosystem," said Professor Xavier Lazzaro, an aquatic systems specialist, who has been closely following pollutants in the lake for many years. REUTERS/Manuel Seoane SEARCH "TITICACA CLIMATE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.