For at least three millennia native communities have thrived around Guatemala’s Lake Atitlán. Long considered one of the most beautiful and picturesque lakes in the world, this 50 square mile inland lake was designated a national park in the middle of the 20th century to encourage tourism. But in 2009, the Global Nature Fund designated Guatemala’s Lake Atitlán as its “Threatened Lake of the Year.” Producer Maria Emilia Martin reports on grass-roots efforts to save Lake Atitlán.