Motley Fool: The global aviation industry accounted for 12% of all transportation-related emissions in 2013. That statistic has pushed The Boeing Company (NYSE: BA ) to rally the industry around new efficiency and sustainability efforts. But what if airplanes carrying payloads inspired by volcanoes held the key to stopping global climate change in its tracks? One pioneering scientist not only thinks it's possible, but given the plan's relatively low annual price tag of just $10 billion, thinks there's a chance...