As Brazil prepares to host the Rio+20 conference this month, its own rapid urbanization highlights the health and infrastructure challenges of promoting sustainable cities worldwide.
Some 89 percent of the global population is now using 'improved' water sources, that are protected from outside contamination. But the finding is controversial.
Mumbai's infrastructure is groaning under the pressure of its decade-long economic boom, as people travel for business and rising incomes put more private vehicles on the road.
This week's best reads deal with India's economic disappointment, Germany's problematic switch from nuclear energy, Al Qaeda, and the Great Un-American Western.
In India, US Secretary of State Hillary Clinton asked Pakistan to do more in taking on radical Islamist groups, including handing over Hafiz Saeed, thought to have had a role in the 2008 Mumbai attacks.
The US Secretary of State Hillary Clinton wants India to stop buying oil from Iran, given concerns over Iran's nuclear program. But can Delhi stop?
Pakistan and India test ballistic missiles to demonstrate military might. But these tests have become separate from politics, in which both countries appear to be developing closer ties.
The Chinese government has underscored its desire for cooperation with India, rather than an arms race.
The successful test launch of India's Agni-V missile means that India now has a long-range missile that can reach China's population centers, giving it a new level of deterrence.
Thousands of disabled commuters navigate busy streets of New Delhi in wheelchairs that look like bikes, powering themselves with their hands and steering with a metal pole.
As solar power becomes more affordable and efficient, it could spread in Africa, much in the way cell phones took over without widespread infrastructure, writes guest blogger Alex Thurston.
The Iranian suspects in the Bangkok blasts were planning to attack Israeli diplomats, a senior Thai intelligence official said. Earlier blasts in India and Georgia also targeted Israelis this week.
India is Iran's largest customer of crude oil, so it cannot cut off ties with the Iranian regime quickly. Yet it shares US concerns about Iran's nuclear ambitions.