Another scientist involved in methane research described the Arctic area as the fastest-warming area on Earth. Euan Nisbet from the University of London said the area has many methane sources that will increase as the temperature rises. He says there is a serious concern that the warming could cause more warming.

Some scientists believe the effects of the freeing of methane will not be seen for many years. Others note that the possibility of a fast methane release could speed up rising temperatures on Earth.

(MUSIC)

BOB DOUGHTY: An American program called the President’s Emergency Plan for AIDS Relief helps millions of people infected with HIV, the virus responsible for AIDS. PEPFAR is considered one of the most successful programs created during the presidency of George W. Bush. Its goal was to change HIV/AIDS from a death sentence to a disease that, while serious, could be treated. And for millions of people around the world, that is just what happened.

But researchers say it was not until PEPFAR started using generic drugs that major progress was made in fighting HIV/AIDS. Generic drugs are copies of medicines developed by large drug companies. But they often cost a lot less.

SHIRLEY GRIFFITH: Researchers from Brown University in Rhode Island studied the effectiveness of PEPFAR. Kartik Venkatesh was the lead author of a report on the study. He says the high cost of patented antiretroviral drugs had an immediate influence on the program after it began.

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