The best revision to the original claim, as a rebuttal to the counterclaim, is: "A wide range of organic materials can be used to make biomass, and sources such as algae are far more energy-dense than wood."
This response effectively addresses the counterclaim by highlighting that not all biomass is created equally, and that there are more efficient and cleaner sources of biomass that can provide significant energy without the same level of emissions associated with wood.