The environmental problems associated with burning of fuels, depend on the fuel in question. The typical fuels that are burned include, wood, coal, petroleum products (such as gasoline or petrol, diesel, kerosene, etc.), natural gas, etc. All these fuels (except for wood) are fossil fuels and have taken millions of years to form. They are in limited quantity and hence will run out, unless we find alternatives. From environmental perspective, the combustion of these fuels generates gases such as, carbon dioxide, carbon monoxide, nitrogen oxides (NOx), etc. Many of these gases (such as carbon dioxide and carbon monoxide) are greenhouse gases and are contributing to global warming. Their continued production, at ever increasing rates, will result in climatic changes. Many of these combustion products are also harmful to living organisms and can cause diseases. For example, particulate matter is harmful to people with asthma, carbon monoxide reduces oxygen carrying potential of blood, etc.
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