A study finds that replacing natural gas with electric and biomass power, along with improved energy efficiency, could help some pulp and paper mills reach zero net emissions. Researchers began with a simulation of mills defined by two characteristics: whether they used virgin or recycled fibers, and whether they were integrated or not. A virgin mill creates pulp and paper from fresh wood… while a recycled fiber mill re-uses fibers which may have been previously processed. A mill is considered integrated if it has the capability to turn wood and other biomass into pulp and paper on site, whereas a non-integrated mill uses pulp produced and dried off site. …The final strategy researchers analyzed was the use of low-carbon alternatives, like using waste wood in boilers instead of fossil fuels. The effectiveness changed depending on whether or not the mill was integrated, but all types saw reductions in greenhouse gas emissions.