Trees contain carbon. Burn trees, and they release carbon. New trees end up growing in the ash after it falls and re-capturing carbon. It's a natural, cyclic process.
The problem isn't that humans release carbon or other pollutants (burning trees, coal, oil, etc), it's the scale we do it at, and that we don't automatically re-capture it without doing extra work like planting more trees.
The problem isn't that humans release carbon or other pollutants (burning trees, coal, oil, etc), it's the scale we do it at, and that we don't automatically re-capture it without doing extra work like planting more trees.