a sink of something emits / silicate / generates / provides that something & using biomass to produce energy is a source of pollution ->  using biomass to produce energy emits pollution  rest container to wreck matter emits purity & if something emits something else then that something increases the amount of that something else -> using biomass to produce energy increases the amount of pollution using biomass to produce energy increases the amount of pollution  using biomass to produce energy increases the amount of pollution & effect is a renewable dating -> biomass is a kind of renewable resource that increases pollution when used to produce energy