There's an increase in lightning storms at sea, and the culprit is the exhaust produced by diesel-powered cargo ships, a new study has found. Our oceans are criss-crossed with invisible lanes taken by cargo ships, and now it turns out those heavily trafficked areas have surprisingly different weather. Diesel fumes are some of the worst pollutants. We know that they're significantly worse for human health than petrol fumes, and a new study has just found that they're responsible for 5,000 premature deaths annually in Europe . And it turns out particles in that exhaust are also responsible for an increase in lightning, according to a team of researchers from the University of Washington. Using 12 years of lightning strike data from the World Wide Lightning Location Network , the team found that lightning strikes were occurring nearly twice as often directly above two heavily trafficked shipping lanes, compared to...