to clean up the yemena activists say this waste has to be diverted and used for irrigation. >> very veryittle treated sewage needs to come back to the river. let's try and divert all of it away to some use or other. so that really needs to be done. >> environmentalists say the poor state of the river is already affecting its ritchey coming and the health of communities. around 60 million people depend upon this river to survive. more than fines and funding, activists say what is that really needed is the political will to save the yemena. karish yvyas new delhi. >> success for two adventures, a 7,000 mile journey comes to an end in mexico. digging for answers in argentina, dozens of new species of dinosaurs. >>> this is the season to party, that is carnivale in vennits. residents say rising water won't dampen their spirits this year. the famous saint marks square awash right there. in rio de janiero super heroes. it doesn't kick off for another two weeks but the spirit of the season is certainly in the air. they are having a wonderful time there. all right. let's turn to rebecca stevenso