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A single cloud hovers above drought effected farmland south of the Australian capital city of Canberra in this file picture taken on December 29, 2006. Circling thousands of feet above Tasmania's farmland in a light aircraft, Christina Nebel prepares to release tiny chemical particles as part of a cloud-seeding scheme estimated to have helped boost rainfall on the Australian island by over 10 percent. The programme is one of a handful globally riding a wave of renewed interest in the decades-old technology as drought hits places from the United States to the Philippines, with the spectre of a strong El Nino weather pattern later this year threatening worse to come. (Photo by David Gray/Reuters)
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