21.   Officials said it is easier to fight the fire on the Italian side, because of the wind currents that are sending gas fumes toward the French side.

22.   Officials said it was easier to fight the fire on the Italian side, because of the wind currents.

23.   The natural wind currents can contribute to the effect, he said.

24.   They navigate by changing the lift of the balloon to ascend or descend into different wind currents.

25.   With the present wind currents, they are heading directly for Chinese territory.

26.   Michio Kanda and Hiro Takezawa were forced down only a few hours after takeoff due to changing wind currents that brought in warmer air.