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Theory:

If the burning process does not emit any flame, then it is called combustion.
Oxygen supports combustion. Even in rockets, oxygen is considerably reduced when it reaches a certain height in the atmosphere. Hence, some amount of oxygen is added along with the fuel for combustion.
 
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A rocket
Carbon-di-oxide:
Carbon-di-oxide occupies less than \(1\%\) of our atmosphere. Plants and animals produce carbon-di-oxide on consuming oxygen for respiration.
Carbon-di-oxide does not support combustion, but it creates suffocation. For instance, whenever fire happens inside a closed room, people trapped in it may feel suffocated. It is due to the carbon-di-oxide which is filled inside the room.
 
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People suffocating due to fire
 
Also, carbon-di-oxide is used to extinguish fires. Fire extinguishers are used to put off fire by throwing a stream of carbon-di-oxide in case of fire accidents.

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Firemen using fire extinguishers
 
The burning of dried leaves and crop remains pollutes our environment. This is due to the emission of carbon-di-oxide gas while burning.
 
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Burning of dried leaves
Reference:
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