the first of its two great tributaries, the white nile, flows from lake victoria, but ourjourney begins, following the blue nile from lake tana as it sweeps through africa's grand canyon to where a dam is being built close to the sudan border. lake tana, the source of the river, is a place of myth and legend. it's the biggest lake in ethiopia and many of its 37 islands have their own monasteries. it's a very sacred place for ethiopian orthodox christians. this monastery dates back to the 14th century. some of these paintings are more than 400 years old. the nile appears in the old testament and legend has it that the ark of the covenant was briefly brought here. but all is not calm on these waters. the struggle for control of this great river is dividing the three countries that share it. the nile is the bringer of life, and from where it launches itself downstream it has the power to bring peace or bring war. this is where the blue nile begins its long journey. from here up in the ethiopian highlands it will cut through caverns and canyons, across plains through sudan and egypt and int

white house. the president's nile of climate change it's kind of mind blowing i don't understand it like how you can not see what's happening right in front of us. just as he hammers his ice ax into the melting glass alan would sometimes like to hammer home the facts about climate change to his fellow americans and ideally witness its impact here for themselves. well it's pretty amazing out here and i challenge everybody to try and get out in the mountains and explore the glaciers while we can still enjoy them i know they'll be here for a while but they're receding and changing so much. it's not too late yet to experience alaska's ice fields and at the moment at least everyone has a little bit of influence over how long this land of adventure continue to exist. the booms planted in ms attentional areas it's. got a real clique in cape town. that. little fences are to protect the housing estate and acoustic courage for the impudent pieces. without trying. to go after africa and thirty nine s. on d. w. . you're going to unofficial estimates more than one point two million venezuelans live in colombia l