An explosion in Prague follows by a day a blast in France, both thought to linked to natural gas. Big natural gas blasts like the one in Prague are rare in the US, but more could be done to avoid them, experts say.
The Arctic saw a record loss of summer sea ice in 2012, and the 2013 melt is off to a faster start than a year ago. Another record is uncertain, but warming has sapped the ice's staying power.
Doing Good
What happens when ordinary people decide to pay it forward? Extraordinary change...
Paul Giniès is the general manager of the International Institute for Water and Environmental Engineering (2iE) in Burkina Faso, which trains more than 2,000 engineers from more than 30 countries each year.
Paul Giniès turned a failing African university into a world-class problem-solver
Today 2iE is recognized as a 'center of excellence' producing top-notch home-grown African engineers ready to address the continent's problems.
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