Polioviruses have been nearly eradicated. But scientists worry their gains face a left-field threat: After vaccination, some people excrete the virus for years.
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 Four months after the epic Indus River floods, farmland in the southern Sindh province remains under water. |
 The search for jobs fuels population growth of at least 500,000 per year in India's capital city of New Delhi. Access to drinking water is a daily scramble. |
 The government in Colombia has to choose between guarding its unique ecosystems or boosting its economy with mining. The decision could exhaust or recast Colombia’s long, agonizing armed conflict. |
 Epic floods recently inundated vast expanses of Pakistan in the worst natural disaster in its recent history. This project will chronicle the domestic and global effort to help Pakistan recover. |
 A look at the water, sanitation and hygiene challenges faced by one the world's fastest growing megacities: Dhaka, Bangladesh, where thousands of people die each year from waterborne diseases. |
 China has more wetlands than any country in Asia, and 10 percent of the global total. They are crucial to life and environment -- and rapidly disappearing. |
 In much of the developing world, women spend more time fetching water than any other activity in their day. For more than a billion people, the water they do get is unsafe. |
 African farmers already struggle to grow sufficient maize, which is a thirsty, fertilizer-hungry crop. What will happen as the climate changes and the population grows? |
 Kashmir, the ruggedly beautiful mountainous region that lies along the India-Pakistan border, was long known as 'paradise on earth,' but in recent decades it has been more like hell. |
 Planet Earth's average temperature has risen about one degree Fahrenheit in the last fifty years. By the end of this century it will be several degrees higher, according to the latest climate... |
 Kenya's Kakuma Refugee Camp was for years among the world's most famous, home to the "Lost Boys" of southern Sudan and as many as 90,000 refugees and displaced persons. |