"Nairobi, Kenya, and Johannesburg -- More than 60 people died Monday in a densely populated Nairobi slum after an explosion and fire caused by gasoline from a leaking pipe. At least 116 badly burned people, many of them children, were taken to hospitals. Many were not expected to survive, as medical staff struggled with shortages of blood for transfusions."

"Six months after the nuclear meltdowns in Fukushima Prefecture, the public's awareness of the threat posed by radiation is entering a new phase: the realization that the biggest danger now and in the future is from contaminated soil."

"ISLAMABAD -- Pakistan's Prime Minister Yusuf Raza Gilani sought international help on Saturday after weeks of monsoon rains killed 141 people and displaced more than 4 million in southern Sindh province."

"The little-known federal agency charged with monitoring the system and enforcing safety measures — the Pipeline and Hazardous Materials Safety Administration — is chronically short of inspectors and lacks the resources needed to hire more, leaving too much of the regulatory control in the hands of pipeline operators themselves, according to federal reports, an examination of agency data and interviews with safety experts."

"The series of fires that broke out in the Bastrop area last weekend and killed two people, destroyed 1,400 homes and upended the lives of countless residents may have been unexpected in scope and in their ferocity. Yet to anyone who has been paying attention, the potential of a massive fire such as Austin-area residents have witnessed billowing to the east could hardly be called a surprise."

"The day the Twin Towers crumbled, more than 25,000 kids inhaled toxic substances. Ten years later, many of them are suffering from health problems that still haven't gone away."

After the 9/11 attacks, government and industry warned that chemical plants were a prime terrorist target that could kill thousands of Americans. They moved quickly to make it harder for the public to know how large a threat the plants posed to nearby communities. But a decade later, the nation has yet to adopt a comprehensive anti-terrorism program for chemical plants.

"BRIDGEWATER, NJ -- The floodwaters deposited by Hurricane Irene have submerged a chemical dump in Bridgewater — one of the most toxic sites in the nation — raising serious concerns and spurring several dozen contractors into action even though some sections remain 13 feet underwater."

"Five million people have been affected by floods in the Pakistani provinces of Baluchistan and Sindh, according to regional officials.

At least 133 people have been killed, officials said, and the number is expected to rise.

About 900 villages have been submerged and about 100,000 homes have been completely destroyed.

"A pipeline bill offered by House Republicans on Wednesday would block some safety reforms and ignores other recent safety recommendations made by accident investigators in response to a deadly natural gas explosion last year near San Francisco."