Changing population densities throughout the continents.

World population growth and estimation from 1750 to 2050

Damian Carrington

Jonathan Watts

Money will be invested in building transport systems that will reduce greenhouse gas emissions

Ashwin Parulkar

These days, Indian policymakers are debating how to create a vast new food entitlement program. There is talk of poor households struggling to cope with high food prices and malnourishment among their children.

John Vidal

By 2050 there will be another 2.5 billion people on the planet. How to feed them? Science's answer: a diet of algae, insects and meat grown in a lab

cnn

Produced by Mairi Mackay, CNN and George Webster, for CNN, Built by Matt Barringer, CNN

The past century has been defined by an epic migration of people from rural areas to the city. In 2008, for the first time in history, more of the Earth's population was living in cities than in the countryside. The U.N.

David Fogarty and Deborah Zabarenko

* Rising population, development put more in harm's way

* Policymakers urged to act in next few decades

* Less emphasis on mitigation, more on cutting risk

By David Fogarty and Deborah Zabarenko  

david biello

The world has never seen anything like China’s dizzying urbanization boom, which has taken a heavy environmental toll. But efforts are now underway to start using principles of green design and smart growth to guide the nation’s future development.