Of course biomass isn't "the solution". There isn't any "the" solution. It's just one technology among many. Burning stuff you've grown puts back into the atmosphere the carbon dioxide that was taken out of the atmosphere growing it. That's recycling for you. It's carbon dixode neutral.

Of course fossil fuel does the same - the difference being that involves putting back into the armosphere the carbon dioxide taken out and stored over millions of years. Not at all a good idea.