reporter: najwa selmi is desperate for her daughters to have a better life. pray to god for them to be successful. my only wish for them is that their needs will be met, especially the essentials. i'm not asking for luxury. reporter: her goal is to expand her business. najwa: i would like to build up my store and sell more items like spices and detergents, which would help when there's no semolina available to make bread. it would help me be able to feed my family, so we don't have to ask for help from others to survive. reporter: in the meantime, many young tunisians are risking their lives, leaving their country in search of a better future. trying to cross the mediterranean sea is often deadly. najwa selmi's eldest son recently managed to reach italy. all she knows is that he's safe. for now, the family's well-being remains entirely her responsibility. host: expanding landfill sites are a growing problem across the globe. every year more than two billion tons of trash get added to them worldwide. if not properly sealed, these depots emit methane, a huge pr