The promise of jobs and prosperity, among other factors, pulls people to cities. Half of the global population already lives in cities, and by 2050 two-thirds of the world's people are expected to live in urban areas. But in cities two of the most pressing problems facing the world today also come together: poverty and environmental degradation.
As long-term Mayor and "Urbanist" you have first hand knowledge experience dealing with the strengths and weaknesses of cities. As you've deftly concluded the poverty and environmental degradation are the result of the informal settlements that are formed by migrants seeking the jobs that grow the city's economy. You, sir, are to be applauded.