A person knowledgeabe of basic natural principles and weather patterns could, for instances, build a line of plants across the path of a prevailing system and dry the air in a manner similar to the way the rockies dry the air that arrives from the Northwest making Denver's weather much drier than that to the west of that mountain range.

Money for this would be available in the middle east and targets galore await. The drought in Ethiopia that spawned "We Are The World" could be recreated and controlled by political forces.

It might only take the removal of a few percentage points of moisture (free water vapor, not electrolisis) to trigger a disaster.

Those paragraphs only represent supposition, but if true would be just as dangerous as a rogue nation openly conducting nuclear tests.

What think ye?