. >>> i'm tarek basely in spain where a new generation of eco friendly air balloons are takes flight. >>> north korea has prompted international outrage after announcing that it has successfully tested a hydrogen bomb. people living in the area said they thought it was an earthquake. the u.n. security council is holding an emergency meeting to discuss how to respond. there is scepticism though, that this was a more powerful device from anyone it had tested before. >>> people stood to watch what they had been told would be an important announcement. [ applause ] >> reporter: on queue, they cheered. state media showed north korean leader, kim ki-jong, signing off on the order. he is a man who likes attention, particularly close to his birthday, which false on january 8th, so this may have been his way of celebrating early. but it could take months or even years to prove if north korea really has successfully tested a hydrogen bomb. it says it deserves to possess nuclear weapons to counter threats from the united states. around the region, leaders responded with familiar alarm. it was no

. >>> plenty more still to come for you here on the news hour, including -- >> i'm tarek basely in spain a new generation of hot air balloons are taking flight. ♪ ♪ >> a company in spain is working on ways to make ballooning greener. our technology editor visited their factory near barcelona. >> reporter: it's dawn in the hills near barcelona, and in the still-morning air, a newly completed hot air balloon is inflated for the first time. the team inspects the rigging and stitching on all of the seams. it's a standard check performed before new balloons are shipped to customers. >>> the spanish company is the world's largest maker of hot air balloons, producing around 200 each year. the design, color scheming of each balloon is customized. >> translator: >> [ inaudible ] just to check -- or double check, because our supplier already checks it, that is good. but we also check it when we receive them. >> reporter: hot air balloons use propane gas to heat the air. a typical hour-long flight can use up to 100 liters. enough to drive a car more than a thousand kilometers. this means it's a gas