people to improve health care in his country, and elaine from vietnam wants to beautify her hometown ho-chi-minh cityand today, we introduce you to a global shaper from colombia. >> medellin's metro system is modern and efficient. the first line opened in 1995. these young people are visiting from all over south and central america to attend the conference of the global shapers initiative. they are interested in learning about how medellin managed to modernise and upgrade its infrastructure. the metro links outlying neighbourhoods, or comunas, that were once the domain of drug lords, to the city center. vigilant staff help keep the public transit system safe and clean. camilo ruiz is one of the organizers of this special sightseeing trip. this is the first time the annual meeting of global shapers is being held in his home town. they are going to visit comuna trece, neighbourhood 13. built on a steep hillside that was once a slum, notorious for squalor, drugs, crime and brutal gangs. jeaneth perez holguin: there are many things that stay with you for life. such as losing family members, friends and n

and elaine from vietnam wants to beautify her hometown ho chi minh city. and today we introduce you to a global shaper from indonesia. reporter: every morning esri nurhani prepares the food she'll later be selling at the market. she's a micro-entrepreneur. her snack bar ensures her an income with which she supports her family. today she has a guest, 29-year-old andi taufan. he recently gave her a small loan so she could start her business. esri nurhani invested in cooking utensils and basic ingredients. esri: every day i spend around 150,000 rupiahs and sell the food for 200,000, so my profit is around 50,000. reporter: 50,000 rupiahs a day are the equivalent of almost 3 euros 50. it's not much, but it's enough to make ends meet. andi taufan has helped many people build up a livelihood. his organization offers microcredit to groups that organize themselves. andi: engage them with us. try to invite them to participate and to make them accountable. the way we can do it is by creating a social control by credit groups. the group mechanism can ensure that ever