By Mohan Guruswamy HYDERABAD: Hyderabad is the 24th largest city in the world. The twin cities of Hyderabad and Secunderabad have 5.3 million people living in 172 sq km and by 2030 will be home to 10.15 million. This will mean more motor vehicles, more commuting, congestion, effluents and chaos. The twin cities are among […]