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When fossil fuels are burned, they release energy stored years ago.
Many substances can be burned to release heat energy, pretty much anything. However, water or ice is one that can not.
fats
Oil contain chemicals which release energy when burned
fuel
fuels are burned to release the chemical energy
Because the body will have to release the fat for energy, which is then burned by mitochondria in the cells for energy to exercise.
Metabolism.
You release heat energy into the atmosphere = which is a bit of a waste
They are all burned when used as energy sources (apex)