Tell us about yourself!
Yeah... No. You are mistaken, I'm afraid. Combustion of the products of gasification (at sufficiently high temperatures) creates mostly carbon and water, as someone pointed out above. Carbon is super duper stable in elemental form and not a problem for the greenhouse effect. On the other hand, methane and CO2 from rotting wood, are big drivers of the effect. In sum, gasifying and combusting wood is not only carbon neutral, it would likely sequester large amounts of carbon in stable elemental form and lead to a reduction of greenhouse gases, ceteris paribus.