Neon is an element, classified as a noble gas, and it has nothing to do with burning wood. Neon does not burn, nor is it produced by burning.
Soot is often produced when burning wood.
Wood ash (potash) is the main result of burning wood and potash can be used in the garden as a fertilizer. Also, if wood is slowly burnt (charred?) in a kiln, where oxygen is kept out, charcoal is produced.
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Burning fossil fuels and burning wood produce similar pollutants because wood and fossil fuels are both consist of hydrogen and carbon. Carbon dioxide is produced when burning wood and fossil fuel.
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Any chemical reaction produce a new substance.
This kind of energy is called renewable energy.
Burning produces smoke (carbon) and gasses, such as Carbon Dioxide and Carbon Monoxide, along with water vapor. Ash is left after the wood is burned. We use our wood ash as fertilizer in our garden, for our grapevines, etc.
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