In response to the item immediately below, which kicked off this Thread, I’ve gotten reports from different corners of the country. My intention with the thread-organization here is to have a running chronicle, or billboard, of news and developments pro and con.
This item is about two-stroke engines, which North Americans and Europeans now encounter with gas-powered leafblowers (and some other lawn equipment) but otherwise aren’t in widespread use in developed countries any more. If you’ve spent time in Southeast Asia, India, much of Africa, or other parts of the developing world, you know these engines as the put-putting source that powers scooters, some jeepneys, the motorized tricycles known as tuk-tuks, etc.
You find two-stroke engines in poorer countries because they’re cheap. You don’t find them in richer countries because they’re so dirty and polluting. An NIH study in 2004 estimated that two-stroke engines were, by themselves, a major source of air pollution and pollution-related health problems, throughout Asia. Without getting into details, the main reason for the difference is that two-stroke engines are much less efficient in combustion than four-stroke engines (which are standard in cars); they burn a mix of oil and gasoline; and they emit a lot of this combustion mixture directly into the atmosphere, unburned.