hilda ellison villain wave or a city of one and a half million that has no proper sewage system. that has lots of water but ninety five percent of it is polluted and there's little political will to change class. frederick says nairobi struggles with traffic emissions housing estates that are filled with smoke as a result of garbage burning and plastic that some bottles everywhere which also clog up drains. zeno says khartoum is a quiet city between two rivers which give the place a special charm but one problem is the lack of cleanliness in many areas very serious in concepcion in chile where rush hour traffic is a big problem he'd like to see an overhead railway system to relieve the pressure on the street. thank you for all you can. most big cities struggle with traffic congestion and car emissions could images like these one day be a thing of the past what's needed is an environmentally friendly alternative to gasoline and diesel. which could come in the form of electric vehicles we meet an engineer who's not only designed his own electric car he's also forging ahead with man