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Engines Engines are found all around our very day lives. They are found in our cars, trucks, vans and motorcycles. Almost all vehicles run on the basic combustion engine. An internal- combustion engine is any type of machine that gets mechanical energy from the expenditure of the chemical energy of fuel burned in a combustion chamber. There are four main types of internal- combustion engines, they are: the Otto - cycle engine, the diesel engine, …

…are a great help in our every day life they pose a danger to our environment. In 1985, the discovery of an "ozone hole" over Antarctica brought attention on the idea that humans can have a big impact on our environment. Our vehicles cause a part of the ozone depletion, the carbon dioxide that comes from the engines then out the exhaust and goes into the atmosphere. Engines are convenient but cause damage to our world.