In highly populated Vietnam, whose small landmass of 330,000 square kilometers holds 78 million people, a major concern has always been transportation. Efficient and inexpensive, scooters and motorbikes have become the most popular way of movement of many inhabitants of the large metropolitan centers. The downside of this trend is the environmental effects of pollution generated primarily from the scores of small, mainly two stroke engines that can emit as much or more exhaust as 3 large semi trucks.
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