In 2015 the United Nations announced a radical plan to change the world. Global leaders drew up a list of 17 "sustainable development goals" to create a blueprint for a better future. Governments agreed to support the goals which cover gender equality, health provision, a good education and much more. We've asked 17-year-olds from 17 different countries tell us what they think needs to change if the world is to meet those goals by 2030. Seventeen-year-old Elvis Bonam lives in a slum called Agbogbloshie in Ghana's capital city, Accra. The settlement is close to a huge rubbish dump. It is crowded and noisy and Elvis has to pay to use a rickety bridge over a lagoon to get to school because there are few paved roads in Agbogbloshie. He shows us round his home and tries to find out how cities can be made more sustainable. Presenter: Sana Safi Producer: Joe Kent Project 17 is made in partnership with The Open University.