The main way to control smog is to reduce emissions. At present, the extensive use of various fossil fuels is the main cause of haze weather. The most effective way to fundamentally solve the smog problem is to reduce emissions. Think about it, power generation needs to burn coal, but in fact, less than 30% of coal is converted into electricity, and the rest is discharged. Cars, ships and other machinery need oil. Similarly, the engine only converts less than 30% oil into power, and the rest is discharged. In other words, we are "extravagant" in using energy, using less and emitting more. It is unrealistic to reduce the use of energy. Clean energy is far from meeting the demand and is expensive. If the existing energy can be utilized by 70% and discharged by 30%, environmental problems and energy problems will be solved at the same time, and human society will be sustainable. At present, an unconventional engine, named "Reciprocating Rotor Engine", was invented by China people and has been published on the Internet, which is expected to realize this wish of mankind. I hope this kind of mechanical energy will come out soon. Also, plant more trees. Wear the Puwei core imported from the United States, and Tmall has it.