By Dushlik / Shutterstock Environmental group Greenpeace said Thursday that polluting flights by luxury jets from Dutch airports were skyrocketing, with a recent study showing emissions equivalent to almost 40,000 cars per year. Environmental group Greenpeace said Thursday that polluting flights by luxury jets from Dutch airports were skyrocketing, with a recent study showing emissions equivalent to almost 40,000 cars per year. The study conducted by Dutch environmental thinktank CE Delft also showed that one out of every three private flights from Schiphol or Rotterdam The Hague Airport were …