but critics say that in hasankeyf, they'll be flooded.the last cave dweller plans to pack up and leave after the summer. it's evening, and we're at baker mevlÜt guzel's home. he says he works hard to ensure his six children go to school. but it remains unclear where future generations of his family will grow up. newman!!!!!! >> where should we go? what will happen to us? to our children who go to school here? these are the kind of questions we take with us to bed at night. >> from the time of the first settlements, people have lived here on the banks of the tigris and founded civilizations. in a year, that will all be washed away. >> the picture is often gloomy for our natural heritage. our forests seldom get credit for the multiple ways in which they serve us. as lungs for our planet, water and co2 storage as well as habitat for countless species. how much of that can we afford to lose? and what should it be worth to us? here's a brief on why our forests are so much more than just trees. >> the planet's "green lung." almost 1/3 of the wo