Sami Yassa, senior scientist at the US based NGO the Natural Resources Defense Council (NRDC) and their scientific lead on forests and forest biomass,  sets out NRDC research on the use of Bioenergy with Carbon Capture and Storage (BECCS) which looks at whether it can really produce negative emissions.  He also explains NRDC's work with the US Congress on biomass.Further reading from Sami Yassa:·         NRDC's recent research on BECCS·         Further explanatory documents and data from the research ·         NRDC US Congress work around biomass and ensuring scientific independence for US environmental agenciesClick here to visit The Future Unrefined, our curated collection of articles and podcasts on raw materials and extraction. Find more podcasts and articles at www.landclimate.org