This process is called combustion . A similar process occurs inside plants and animals. It is called respiration . During this process, carbon dioxide is released to the atmosphere. In other words, flamability is how easily a fuel ignites and how quickly the flames spread to nearby fuel.
Many factors determine the flammability of fuel.
During some seasons, forests experience low temperatures and large amounts of precipitation. These conditions keep the vegetation cool and moist and decrease their flammability. That is to say, the vegetation become less likely to ignite and burn. However, seasons of high temperatures and little precipitation can reduce the amount of moisture in the forest fuels and increase their flammability. This allows them to burn more quickly and intensely once ignited.